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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From the ski slopes to alpine climbs to sleeping out under the stars, our in-depth analysis derives from real-world adventures undertaken while wearing each model.

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. That’s why a mid weight base layer from one brand may feel warmer than a mid weight from another brand. On cold bike rides, a base layer with thumb holes blocks out that gale blowing up my wrists and provides a fraction of extra padding for the heels of my hands.

When I use the thumb loops in my BAM Bamboo base layer on a cool trail run, it prevents my hands and wrists from feeling the chill without having to layer up with running gloves. More and more companies are joining the effort to be more Earth-friendly in the production and sales of their products. They’ll pay to repair, replace, or refund any piece you’re not happy with and only charge a nominal fee to professionally repair any damage due to wear and tear.

While synthetic material is superior to wool in durability, wool is superior to synthetic because it doesn’t retain odors.The Icebreaker Merino BodyFitZone 150 is our favorite lightweight base layer due to its high quality construction, technical venting features, and cozy softness. However, within a brand, their lightweight will always feel less insulation than their heavy weight. While we may love the fabric of a base layer top, if the base layer bottom doesn't fit right, it won't feel comfortable.