The Men's Apex Long Sleeve Half Zip in our 'Toothstripe' print is a midweight merino baselayer top, and a perfect crossover layer for ski trips and winter travels. The Apex Long Sleeve is highly breathable, ideal for any cold-weather layering system. Our 250gm, 100% merino jacquard fabric provides a warm, sweater-like feel. It cuts the chill on frigid ski tours and shoulder-season hikes, and offers natural odor resistance on busy days around town or extended travels. Forward side seams and offset shoulder seams prevent irritation while wearing a backpack, and a secure zippered sleeve pocket keeps your ID, lip balm and other small essentials secure.