Soneven Long Sleeve Running Top Womens with Thumb Hole Compression Thermal Base Layer Ladies Fleece Tops T Shirt Lightweight Sport Yoga Top Quick Dry for Workout Hiking Skiing

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Merino wool is great at temperature regulation and will help keep you warm on colder days and cooler on warmer days. Merino doesn’t dry fast if it is not in a dry environment, however, it will still keep you warm and won’t make you feel clammy even when wet. I grabbed Helly Hansen kids wool base layers on sale and they are the ones my daughter reaches for first. TMM Team Member Anna Cons: This is a premium fabric, with a premium price tag to match. Some of our testers also found it less comfy to wear than some synthetic tops. Synthetic material The final brand loved by tweens and teens among our group are the REI Co-op Long Underwear Tops/Bottoms.

Not surprisingly, the tops that earn our highest scores for breathability (the Outdoor Research Echo L/S and the Patagonia Capilene Cool Lightweight L/S) are also made from the lightest weight fabrics. For warmer weather and high-exertion activities, these are some base layers to consider closely. Comfort and warmth are paramount when skiing, and this Decathlon second skin will take you merrily up and down the mountains. The material (96% polyamide) feels more premium than that of some pricier tops on test, but you might wish to layer up, as some testers wanted to feel cosier. If you’re on a budget, it’s a solid all-rounder. We love the Patagonia Capilene Midweight and think it shines as a running base layer. It's the best synthetic base layer out there, with decades of refinement and perfection. This synthetic base layer is versatile, suitable for wearing by itself or layering under a mid-layer. While there are less expensive synthetic base layers, the quality and durability (not to mention relative eco-friendliness) of the Capilene Midweight make it the best choice for synthetic. With thumb holes, it’s much easier to slide your arm into the next layer and avoid bunching up on the inside (Image credit: Getty) 4. Hand protection for scramblingThe Smartwool Classic Thermal Merino Base Layer is our winner for best base layer for extreme cold. It's got everything we love about the Smartwool All Season, but is the best heavyweight base layer for versatility, fit and comfort, quality and durability, and warmth. We like the Swiftly Tech for crisp morning walks, runs around town, or outdoor yoga. But we want to recommend base layer tops that look good on you, perform, and will last. To identify what qualities to look for, we interviewed Tucson-based professional trail runner Ashleigh Thompson (she/hers). A member of the Red Lake Ojibwe Nation and a Ph.D. Candidate in Anthropology at the University of Arizona, Ashleigh believes being outside is paramount to healing and happiness. She promotes recreating respectfully on Native lands and creating outdoor spaces that are welcoming to everyone. WARMTH

An uber comfortable, warm, and breathable 100% Merino wool base layer for the coldest of conditions What we liked: Body mapped fabric vents heat, comfort, seamless anti-itch fabric, fit, functionality If it’s warm outside, a lightweight layer might be the only layer you wear. Our men’s base layer tester, for example, gets sunburned easily, so he wears lightweight, long-sleeved base layers year-round. We love that the more prominent companies use their influence and resources to offer more inclusive sizing. WHAT IS YOUR PREFERRED OUTDOOR ACTIVITY? ARE YOU LOOKING TO WEAR YOUR BASE LAYER UNDER OTHER CLOTHING?On the flip side I have another child that is always complaining of being cold. Her teachers at school tell me every year that she wears her winter coat in the classroom all day long. Let’s be honest, we all fared perfectly well without them before (Image credit: Susumu Yoshioka) 5. Sun protection If they are using them and don’t love them or avoid wearing them then it might be worth trying another brand to get a fit, fabric, or style that works better. Another thing we liked about the Smartwool Thermal is that it's available in some of the most inclusive sizes of any base layer brand, with women’s available up to 3X. The Smartwool 250 was one of our favorites in our Plus Size Outdoor Clothing and Plus Size Winter Outdoor Clothing guides. Zip base layers help you manually vent off some heat when you're working hard. Zip lengths go from ¼ zip to ½ zip. Zip base layers tend to be more technical and are often more expensive.