How to Choose Base Layers

From ski tours to climbing trips, move through the mountains in the thermoregulated comfort of the men's Arc'teryx Rho Merino Wool Zip-Neck base layer top made of a soft, light and durable wool blend.
Imported.
View all Arc'teryx Men's Base Layer TopsBest Use | Multisport Snowsports |
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Shirt Type | Partial-zip |
Fabric | 240 g/m2 Mountain Merino Wool: 95% wool/5% elastane; Chira 6.5 oz. (220 g/m2) stretch nylon interlock: 71% nylon/29% elastane (bluesign-approved material) |
Moisture Wicking | Yes |
Underwear Weight | Midweight |
Sleeve Length | Long Sleeve |
Gender | Men's |
Sustainability | Wool certified to the Responsible Wool Standard (RWS) Fair Trade Certified |
XXS | XS | S | M | L | XL | XXL | XXXL | XS Short | S Short | M Short | L Short | XL Short | XXL Short | S Tall | M Tall | L Tall | XL Tall | XXL Tall | 28 | 30 | 32 | 33 | 34 | 36 | 38 | |
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Chest | 33 | 35 | 37 | 40 | 43 | 47 | 51 | 54.5 | 35 | 37 | 40 | 43 | 47 | 51 | 37 | 40 | 43 | 47 | 51 | |||||||
Sleeve Length | 30 | 31.5 | 32.5 | 34 | 35 | 36 | 37 | 38 | 32 | 33 | 34 | 35 | 36 | 37 | 33 | 34 | 35 | 36 | 37 | |||||||
Waist | 27 | 29 | 31 | 34 | 37 | 40.5 | 44.5 | 48.5 | 29 | 31 | 34 | 37 | 40.5 | 44.5 | 31 | 34 | 37 | 40.5 | 44.5 | 30 | 32 | 34 | 35 | 36 | 38 | 40 |
Hip | 32.5 | 34.5 | 36.5 | 39.5 | 42.5 | 46.5 | 50 | 54 | 34.5 | 36.5 | 39.5 | 42.5 | 46.5 | 50 | 36.5 | 39.5 | 42.5 | 46.5 | 50 | 35.5 | 37.5 | 39.5 | 40.5 | 41.5 | 43.5 | 45.5 |
Inseam | 31 | 31 | 31.5 | 32 | 32.5 | 33 | 33 | 29 | 29.5 | 30 | 30.5 | 31 | 31 | 34.5 | 35 | 35.5 | 36 | 36 | 31.5 | 31.5 | 32 | 32 | 32 | 32.5 | 33 |
Measurements are stated in inches unless otherwise indicated.
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The Rho Merino Wool Zip Neck is an outstanding base layer. The merino wool feels luxuriously soft against the skin and offers impressive warmth without bulk. Paired with a Proton mid layer and a Beta shell, it kept me perfectly comfortable in sub-zero temperatures while remaining breathable during activity. The fit is precise, the construction is impeccable, and every detail feels thoughtfully designed. It is warm, comfortable, and built to perform in demanding conditions. I highly recommend it to anyone who values both comfort and performance in their cold-weather gear.
Having paid such a high price for this item, I was fully commitment to its care. I diligently followed the provided washing instructions. However, regrettably, the sweater has stretched to an extent that renders it irreparable. Despite my initial investment, the quality of the product did not hold up as expected, resulting in a disappointing experience. * For some reason I don' have option to upload photos on this form. (???)
Hi there, we are sorry to hear about the issue you are experiencing with your Rho Merino Wool Zip Neck. Thank you for sharing your feedback and we'll make sure to relay it to our design team. Feel free to fill out a Product Service Request form, and our team will examine it to determine how we can assist you. https://arcteryx.com/ca/en/help/product-service/service-request
Not sure how folks wound up with some of the complaints in other reviews, but I certainly haven't. It fits well (I'd like it a tiny bit tighter, but it's certainly still fitted), is fantastically soft and comfortable on skin, hasn't stretched in the least bit despite numerous washes, and has become a favorite base layer alongside a few from SmartWool. I'll be getting other colors, too.
Glad that Arcteryx brought the merino baselayers back Great fit, good length and a nice stretch..........with the added bonus of a quarter zip The weight of this one feels like approx 200 Suggest adding a couple different weights (150 and 250) and a few other colors
Bought this and the Rho Hybrid. The Rho Hybrid is awesome - one of the best shirts I've used. This Merino version is awful though - seems like a low quality wool - very itchy and is making my skin break out in hives.
Hi there, thank you for providing your feedback. We are sorry that the Rho Merino Wool Zip Neck did not meet your needs. We appreciate your honest review. This not only helps our guests to see feedback from other users but also helps us to better our products for seasons to come.
Super comfortable, great fit. The collar is excellent, just the right length and a snug but comfortable fit around the neck.
This is a great casual garment and super warm. I have many other Arcteryx items all have performed exemplary.
Super comfortable and light base layer or only layer on the warm hikes. .
Warm and fit perfect (Size L). Breathable and warm even in colder days.
Keeps you cozy and comfy all day and night, wool is magical