When it comes to base layers, today's high-tech fabrics and designs ensure that there's a perfect insulating option out there for every guy, no matter how you like to work up a sweat
Patagonia Wool 3 Long-Sleeve Crew
Want a wool sweater you can wear next to your skin without breaking out in hives? Look no further. This mock thermal is made from superfine merino wool that won't make you itchy, and it will keep you warm in a blizzard.
» $92 @ patagonia.com
Your favorite surf shop now makes clothes you can wear year-round. Quiksilver's new line of workout wear is made of light, stretchy fabrics that are ideal for wicking moisture away from your skin and letting your body breathe as it heats up.
» $45 @ quiksilver.com
Helly Hansen Dynamic Crew Block
Designed to be worn during high-intensity sports all year long, Helly's LIFA sport fabric dries fast and resists the funk that most synthetic fabrics accumulate after long days of wear on the slopes or the trail.
» $42 @ hellyhansen.com
Icebreaker Slalom Zip
As the name suggests, you can throw this merino-wool midlayer on under your ski shell and hit the slopes knowing you'll stay warm in the icy conditions-and still look sharp when you hit the lodge later on.
» $100 @ icebreaker.com
Nike Dri-Fit Long-Sleeve Tee
Nike Dri-Fit is the ultimate all-around base layer for workouts in the gym and outdoors. Wear layers over this long-sleeve crew for cold-weather workouts, or wear it solo to stay cool during indoor training sessions.
» $35 @ nike.com
Under Armour Full Metal Long-Sleeve Tee
The Full Metal tee has a mesh back for greater flexibility and compression fabric in the front that helps prevent pulled muscles. Plus, the raglan-cut sleeves take the seams off your shoulders, reducing the risk of chafing as you sweat.
» $50 @ underarmour.com