The fabric's open knit invites airflow and provides excellent wicking for endurance activities in warm to moderate temperatures; our fastest-drying Capilene fabric is also insulative enough for use on chilly days and can be worn beneath other baselayers Self-binding neck soft against skin Raglan sleeves and underarm panels merge out of the way of straps Flat-rib panel-piecing under the arms and sides eliminate chafing, is super breathable and fast drying Tuckable length 4-oz 100% polyester (54% recycled) with Gladiodor™ natural odor control. Recyclable through the Common Threads Recycling Program 145 g (5.1 oz) Imported.