Icebreaker's midweight, long-sleeve half-zip baselayer that's ideal for cold conditions, the Apex Long Sleeve Half Zip is a highly breathable foundation for any winter layering system. Made with Icebreaker's 260-gram weight, 100% Merino fabric, the Apex features a half-zip design to help regulate body temperature, & offers natural odour resistance on high-output days & extended travels. Forward side seams & offset shoulder seams prevent irritation while wearing a backpack, & a secure zipped sleeve pocket keeps your ID, lip balm & other small essentials secure.