Comparison review: Comparing the base layers that are perfect for winter trail running [RUN+TRAIL collaboration project]

We have contributed a comparison impression of the base layer that is perfect for winter trail running to "RUN+TRAIL Vol. 23" published by Sanei Shobo, which will be released on February 27th!

Most of the articles I contributed to so far have been re-editing the content that was originally published on the site, but this time I will be reviewing a newly written review that has been a collaboration between RUN+TRAIL and Outdoor Gearzine, and has been comparatively and evaluated new items as magazine projects over the past month.

This issue introduces the selection of shoes that everyone is interested in when running trails, to backpacks, and this base layer, as well as wise ways to choose key items from a user-friendly perspective. There are also many interesting content, including multifaceted interviews about the situation where the trail running activity is in place. Please try picking it up.

As mentioned above, Outdoor Gearzine was responsible for the impressions of the base layer for winter. We have picked out a variety of models, including materials, forms, and functions, and compared and reviewed them. This time, I would like to arrange the articles published in magazines by adding additional information for websites, etc. That's all for you.

table of contents

• About the items we compared and tested this time
• Test results and spec comparison table
• Individual impressions
• Actual impressions [General review]

The best part of trail running is that you can freely enjoy the charm of nature, which shows a variety of expressions throughout the four seasons. With the season set to an end, there are surely many runners looking forward to a quiet field.

Choosing the right clothing is more important than ever to enjoy such winter trail runs safely. The basic concept is the same as outdoor activities such as mountain climbing, and the basic principle of all this is "layering," which involves layering clothing with different roles, in response to multiple challenges such as blocking the cold of the outside air and quickly releasing large amounts of sweat outside the body.

Among these, base layers, which are clothing that adhere to the skin, can also be a direct cause of accidents such as hypothermia, and it is no exaggeration to say that it is the key to winter layering. This time, we have actually compared the base layer, the key layer for choosing winter clothing, from the perspective of using it on trail runs.

About the base layers compared this time

Needless to say, the most important thing to be careful about during this season is to deal with the cold. In winter, if you don't prevent it from getting wet or getting cold from outside than in summer, your life will be in danger. Therefore, unlike autumn, when sweat absorption and quick-drying was the most important factor, winter base layers require reasonable heat retention. However, unlike mountain climbing, excessive heat retention is likely to cause discomfort when you go to trail runs, which are intended to continue moving vigorously, and in that sense, it can be said that it is required to have more sweat-absorbent and quick-drying properties than models for full-scale mountain climbing, as well as mobility such as fit and ease of movement.

Looking at the base layers over the past few years, its evolution has been remarkable. The current situation is that various technological innovations are being carried out, including the evolution of materials such as merino wool, chemical fibers, and blended fabrics, as well as through unique sewing and additional functions. So this time, we have selected six distinctive models with consideration to allow you to try out as many variations as possible, such as materials, sewing, thickness, and form. For this reason, some models were given favorable ratings, but we were aiming to finally reveal a style that is easy to use, so in this review, instead of just taking the conclusions at face value, it is best to make the final decision based on the content of the rating.

 

We tried on the item in January to February, on roads in Tokyo and trails near Tokyo, with Tsushima Kohei, who is also writing on the website.

Test results and spec comparison table

Reference: Fit image of each model

Individual impressions

Smartwool PhD Light Zip T

Achieve all the necessary elements for winter running at a high level

The PhD series is a particularly technical category in the smart wool lineup, designed to provide high performance in even more demanding activities. As I did, I was able to experience quality that exceeded my expectations, with features that are perfect for winter trail runs like this one.

The fine, supple feel of high-quality wool, and the mellow seams (seas) that are comfortable to wear. The semi-form fit, which is not extremely tightly, may not be enough for some people, but the carefully mapped pattern does not show any excess sagging even in intense movements. The fabric weight of 210g/m2 is by no means lightweight, but it is the warmth of the product. It was clearly felt that the temperature was taken away when exposed to the wind, not only during normal times, but also in other models. In that case, you may be worried about the weakness in sweat removal, but the unique blend of wool and polyester works well with water, moisture absorption and dissipation, and although the mesh under the armpits does not make it dry, the feeling of stuffiness and wet clothing sticking to the body was mild.

A word from Mr. Tsushima: This is a picture full of features that are useful in winter. It seems to be more effective in situations where temperatures vary widely, such as those over a whole day.

Patagonia Capreen Air Crew

The unique wool blend material makes everyone addictive.

Patagonia's latest base layer, which is interesting in textures that have never been seen before, is an ambitious work that uses the original fabric "Merino Air", which is made from a blended yarn of ultra-fine merino wool and synthetic fibers, knitted in a zigzag and grooved shape.

The first thing that's worth noting is how comfortable it is. The loft (bulk) and grooves created by the unique sewing create a light, soft, and comfortable feel. A gentle fit that gently snuggles up against your body. The warmth created by the layer of air that is close to the body temperature created between the scalp and the scalp will wrap around your body the moment you wear it. What's more, this layer keeps wet clothes away from the skin while running, reducing the tight discomfort.

On the other hand, what caught my eye was that it was too breathable, so it is not possible to expect much heat retention if exposed to outside air without properly layering. Personally, I also found the slightly sweet fit to wear and it was a true fact that it was not enough. In that sense, the best way to use it may be to climb mountains or ski during the harsh winter, but overall it is an attractive piece that can be used in a wide range of ways, from everyday use to the extreme.

A word from Mr. Tsushima: Even one piece is quite comfortable, but once it gets wet, the comfort drops all at once, making it ideal for use in situations where it's not too tight.

Icebreaker Oasis Long Sleeve Half Zip

High heat retention and firm silhouette achieved by 100% merino wool

One of the best features of merino wool compared to other fibers is its temperature and humidity control function. It accumulates heat when it's cold, and when it's hot, it releases moisture from sweat, and keeps the temperature and humidity inside the clothing at the optimum level. The Oasis series, a classic icebreaker series, one of the top brands in the North American merino wool apparel market, is made from 100% of the highest quality New Zealand merino wool, making it a piece that allows you to fully experience its appeal.

First and foremost, the extremely smooth feel and the tight, tight shape of the body stimulate not only functional but also aesthetic sense. However, the elasticity is not that high, so some people may feel a little cramped, so don't forget to try on. The fabric weighs 200g/m2, which is just the right thickness for cold seasons. As expected, there was something wonderful in terms of heat retention, and the moment I put on the fabric, my body temperature was transmitted to the fabric, and I was able to feel the warmth from the whole time I sweated.

However, what you should be careful about is that it does not dry out very quickly, and you won't feel uncomfortable even if you still have sweat. It may not suit people who can't fit in the unique moistness and prefer a smooth, dry feel like 100% synthetic fiber.

A word from Mr. Tsushima: It is easy to adjust the temperature and is highly versatile. It's not easy to feel the cold even when wet, so it's especially perfect for long periods of running, such as long runs.

Rab MERINO + 160 LS Crew

A calculated fit and high quick drying for intense winter activities

The latest model of Merino wool is produced by a British brand that strives to create products that can withstand high-load activities in the world's most harsh locations.

Not just the base layer, I am always impressed by the Rab's cutting technology that keeps both slim and stylish, yet highly mobility, but this model is exactly what I'm expecting. The calculated stress-free fit is impressive. Of course, there is a good chance that individuals may differ depending on their body type, but personally I felt that of the most comfortable and easy to move around on this time I tried it on.

However, there are a few things to be concerned about the materials. The unique wool/synthetic fiber blend material uses 37.5 technology, which attaches carbon, an active particle with many holes, to the surface of the fiber, to the surface of the fiber, making it easier to absorb and dissipate sweat on the skin. Although this trial was quick-drying, I was concerned about the poor separation of the skin after the sweat began to saturate the fabric, which was a shame, and I couldn't feel that it was too dry. Furthermore, although it is a slightly more merino wool blend of 63%, it has a light weight of 160g/m2, and its smooth texture and high breathability made me unable to feel as warm as I had hoped.

A word from Mr. Tsushima: It is thin and stretchy, making it perfect for situations where you run at a higher pace. However, please note that the heat retention is not that high.

Arc'teryx Phase AR Crew LS

No matter how far you go, sweat-absorbing and quick-drying performance keeps you dry

The standard synthetic fiber base layer of Arc'teryx, which was updated this season, is a high-tech model that uses the latest chemical fibers that provide excellent performance in repeated stop and go activities. As always, my maniacal ideas and the uncompromising curiosity that bring them to life are exciting.

What impressed me as I was running was that I never felt wet. This extraordinary smoothness made no difference to others. The secret lies in the newly developed fabric material. One of the two types of fibers with different properties provides a dry feel due to its high hydrophobicity, while the other absorbs moisture towards the surface and provides high quick-drying properties. By woven in different proportions on the front and back of the fabric, the two layers of dry skin and sweat absorption and dissipation on the surface are more efficiently processed.

The drawback is that the fabric is less stretchy than other models, and it is difficult to fit depending on your body type. In my case, the discomfort caused by gaps around my shoulders and chest did not go away. I was also concerned about the lack of heat retention, which is the fate of 100% synthetic fibers. When using in the winter, it is essential to take measures such as layering thoroughly with intermediate clothing.

A word from Mr. Tsushima: The smooth fabric is easy to put on and take off, and is also excellent for absorbing sweat and drying quickly. On the other hand, it may feel a bit cold in the winter.

mont-bell Geoline LW round neck shirt

Comfort, functionality, safety, and cost-effectiveness. The appeal of the ease of use is to keep the key points in mind

It has been a classic among hikers due to its overwhelming cost performance. Actually, I also considered a thicker model, but I chose this one with the confident words of the shopkeeper.

My first impression is that it's obvious that it can be used even in the summer, so it's just natural, but it's just too light. The L size is about 133g, which is about 100g compared to the heaviest model of this year's 220g, but when I actually compared it, I felt the difference in comfort was clear. As it is 100% synthetic fiber, it has a high performance that is impressive in terms of sweat removal and quick drying. What surprised me most was that despite its lightness (thinness), it was softer than I expected when it was in no wind. The fibers themselves retain air and even frizzle, making it easier to create an insulating layer, and the ultimate method is to warm the body from the core by the radiant heat of the ceramic kneaded into the fibers, making it excellent insulated heat per weight.

However, when comparing it with other models, it is inevitably limited to heat retention, and it is true that in terms of comfort, it is inevitably a concern about the rough texture that is more comfortable to wear than merino wool. The short sleeves give it plenty of room in the sleeves and waistline, and the shape doesn't suit your body type, but it also feels a bit loose for use as a runner.

A word from Mr. Tsushima: It was thin and light so I was able to run without any stress. It is best to use in situations where you are pushing hard.

[For those looking for a first-degree comfort] The highly-recommended high-performance mesh underwear is highly recommended.

Have you heard that in recent years, items known as "high-performance mesh underwear" that can significantly increase comfort by attaching them further below the base layer have gradually become popular.

There are two major benefits to these underwear. One of the effects is that it boosts the "sweat-absorbing and quick-drying function," which is one of the roles of the base layer, thanks to its extremely increased sweat-processing ability. However, some people may think that at this rate it is no different to a thin mesh shirt for summer use. Another major advantage that high-performance mesh underwear differs from these is that it significantly reduces the ``cold sweat'' problem of the base layer.

Generally speaking, you might imagine mesh fabric as being "cool," but if you actually wear these models with the base layer and move around, you'll be more than ever before that the slight warmth continues even when you're sweating. For example, in the case of Millet's "drynamic mesh," the absorbed moisture is quickly passed to the upper layer, and at the same time the mesh part holds dead air, creating a comfortable layer that is close to body temperature, achieving heat retention.

Although the approach varies depending on the brand, the common concept is that it significantly reduces sweat discomfort and coldness, dramatically increasing comfort when you are at work all year round. If you want to push yourself harder or want a higher level of comfort, we recommend that you try it out.

If you are interested in more information about high-performance mesh underwear, please refer to this feature page .

Outdoor Gearzine's recommended high-performance mesh underwear: MILLET DRYNAMIC MESH series

Actual impressions [General review]

It is generally said that synthetic fibers are excellent in sweat removal and quick drying, while natural fibers such as wool have excellent heat retention, but through this try-on, I realized once again that each model has a variation in performance that is so uneasy to the general idea that it is not easy to clean up. For example, even if you have just one material, the properties of the blend vary surprisingly depending on the composition and proportion of the blend, and even if the same merino wool are the same quality and sewing.

With this in mind, what really impressed me overall was the overall ease of use of merino wool during winter activities. To make your winter trail run comfortable, high sweat handling ability, heat retention that keeps you cool even when sweat evaporates, and comfort and fit that reduces stress as much as possible are all essential elements. In that sense, it was impressive that merino wool, which is not one of the best, was well-balanced in everything, and was the most comfortable and easy to use in the end.

In particular, smart wool takes advantage of the high heat retention of merino wool, which doesn't bother the wind, but also provides comfortable fit, fit, sweat removal, etc., and is a very balanced and high level in everything, including the adjustable collar and sleeves. Incidentally, the zippers under the neck, thumb holes, and underarm mesh were more effective than you could imagine for temperature control and effective ventilation, so it's a good idea to choose a model with these features added to other brands.

On the other hand, models like Arcteryx are exceptionally excellent in terms of sweat processing capabilities, of course, not that they are not suitable, but there is a good chance that they can be more comfortable by adding insulation and windproofing through layering. The important thing is to understand the characteristics and perform appropriate layering, and the overall function works well. If you don't get it right, all six of the models featured here will be incredible.

Finally, what we should not forget is that the two of us tried on and evaluated each of us this time is that the characteristics and ratings required vary slightly depending on the wearer's body shape, competition level, and preferences. In fact, numerical differences between each item are quite a hassle. I would like to add at the end that individual impressions and numbers are merely a reference, and that in the end, what is important is the feeling you feel when you actually wear them.