The Capilene® 2 LW Zip-Neck is Patagonia's stretchiest, most breathable, quick-drying synthetic base layer in a zip-neck top! It provides excellent wicking for endurance activities in warm to moderate temperatures. The Capilene 2 Lightweight fabric has an open knit that is naturally stretchy, invites airflow, dries fast and is ideal for layering. It has a full coverage zip-neck for easy climate control and is backed by kissing welts that provide low-bulk comfort next to skin. The raglan sleeves merge out of the way of pack straps and the side seams roll forward for comfort under layers. This zip-neck sweatshirt has a straight hem and is cut long enough to tuck in. This slim fit shirt weighs (6.2 oz) 176 g. The shirt is made of 4-oz polyester (54% recycled) circular knit with Gladiodor® natural odor control. It's even recyclable through the Common Threads Recycling Program!