Tops

Smartwool has updated the fit of our Men's Merino 250 Base Layer 1/4 Zip to improve functionality while also enhancing aesthetics. As one of their heaviest base layer tops and best base layers for cold weather, this garment uses 100% responsibly sourced Merino wool, shoulder panels, and a flatlock seam construction to help minimize chafing as well as help keep you comfortable and temperature-regulated as you enjoy high-intensity skiing, hiking, running, and more.

Meet the better-than-ever Men's Merino 250 Base Layer Crew. Smartwool has updated this 100% Merino wool fan favorite with new colors and a new fit to improve functionality while enhancing aesthetics. Shoulder panels eliminate top shoulder seams, and a flatlock seam construction helps prevent chafing. Add one of their best base layers for cold weather to your winter wardrobe and experience the difference the next time you go skiing, hiking, climbing, or biking.

The athletic fit of Smartwool's Men’s Merino Sport Ultralite Long Sleeve complements the movements of your body. With comfort features like offset shoulder and side seams to help minimize chafing, this very light and soft tee is made with a blend of ZQ-certified Merino wool with TENCEL™ Lyocell fibers, so it helps you feel cool even as your activity intensifies. Plus, it’s designed with reflective elements for low-light conditions, so this tee is great as a standalone for early-evening runs or as a baselayer for your next cool-weather adventure.

A classic, all-around 100% recycled polyester baselayer. The smooth, soft face makes for easy layering. Hollow-core yarns and a diamond-grid back trap warm air, wick moisture and dry fast. HeiQ® Pure odor control keeps things fresh. Fair Trade Certified™ sewn.

The lightest base layer top that’s perfect for active adventure and everyday training, the 150 Zone Long Sleeve Crewe features 150gm jersey corespun with LYCRA® to maximize flexibility.

The lightest base layer top that’s perfect for active adventure and everyday training, the 150 Zone Long Sleeve Crewe features 150gm jersey corespun with LYCRA® to maximize flexibility.

A classic, all-purpose base layer T-shirt made with soft and breathable 100% merino wool fabric, the 175 Everyday Short Sleeve Crewe is as versatile as it is comfortable.

A versatile 100% merino wool base layer top with a classic zip-neck design, the 200 Oasis Long Sleeve Half Zip combines casual comfort with technical performance.

A versatile 100% merino wool base layer top with a classic zip-neck design, the 200 Oasis Long Sleeve Half Zip combines casual comfort with technical performance.

A versatile, go-anywhere shirt made from breathable 100% merino wool jersey, the 200 Oasis Short Sleeve Crewe is our best-selling base layer top. Fibers that regulates the body temperature in all weather conditions, along with resisting odors; gusseted underarms for mobility and comfort

Icebreaker's lightest base layer top that’s perfect for active adventure and everyday training, the 200 Zone Long Sleeve Crewe features 200gm jersey corespun with LYCRA® to maximize flexibility.

Their technical, cold-weather base layer top for highly aerobic days, the 200 Zone Long Sleeve Half Zip features zoned ventilation panels for active temperature regulation and ample breathability.

Their technical, cold-weather base layer top for highly aerobic days, the 200 Zone Long Sleeve Half Zip features zoned ventilation panels for active temperature regulation and ample breathability.

A warmer, midweight version of the best-selling Oasis, the 260 Tech Long Sleeve Crewe is a go-to piece for winter layering, made with 100% merino wool.

A warmer, midweight version of the best-selling Oasis, the 260 Tech Long Sleeve Crewe is a go-to piece for winter layering, made with 100% merino wool.

A technical, cold-weather base layer top for highly aerobic days, the 260 Zone Long Sleeve Crewe features zoned ventilation panels for active temperature regulation and ample breathability.

A soft, stretchy base layer T-shirt for active layering and everyday comfort, the slim-fit Anatomica Short Sleeve Crewe features an ultralight 150gm merino wool corespun fabric. Anatomica tees fit tighter than other tees in Icebreaker's range and generally have a wider neck opening, just size up if you like a looser fit.

A premium, slim-fit base layer made with luxuriously soft 15.5 micron merino wool fibers and a high-neck design for added protection, the MerinoFine™ Long Sleeve Roll Neck is at the intersection of comfort and performance.

A unique 2-in-1 base layer crew with a with a warm-breathable 100% merino wool exterior and a 100% LIFA® wicking interior. The versatile LIFA® Merino Midweight Crew Base Layer adapts to any type of cold weather. Combined with a 100% merino wool layer with their proven LIFA® Stay Warm Technology in a fitted 2-layer construction. LIFA® Merino Midweight Crew Base Layer delivers all the breathable warmth of merino wool fibers, plus the unique moisture management properties of LIFA® fibers.

The original technical Helly Hansen base layer has never looked better. They took inspiration from the iconic sailor strip for this long-sleeve crew. The technical base layer provides breathable warmth, moisture management and comfort during any aerobic activity. It’s ideal for sailing, hiking, training, climbing, skiing and more. They've been excelling at HH LIFA® base layer technology for 40 years. That’s why their base layers are the go-to choice for professional athletes.