If you've never tried a merino wool active top when you're working up a sweat in cool weather, you're in for a treat with the Icebreaker Men's Long-Sleeve Relay Zip-Neck Top. Icebreaker's soft and lightweight merino wool is breathable, regulates temperature, moves sweat away, and does not hold odors, so you stay more comfortable and fresh during your workout. You can also feel good about wearing a sustainable, all-natural material. In addition to the top's merino wool benefits, smart design features add to your comfort. Raglan sleeves and gussets allow for free movement and contrast flatlock stitching eliminates chafing while contributing a nice style touch. The zip neck collar allows you to customize your level of insulation or venting and thumbholes keep sleeves in place while you're moving.