Boys will be cozy and dry wearing the Terramar Body Sensors Boy's Micro Polyester Fleece Long Sleeve Crew. Thermolite double fleece construction features hollow core fibers for excellent warmth with less bulk. Powered by Terramar's unique ec2 Qwik Dri thermoregulating technology, the Thermolite fabric is lightweight, moisture wicking, and breathable. Works great on its own or as a baselayer for cold weather. Constructed of 100% micro polyester fleece fabric. ec2 Qwik Dri Thermoregulation Comfort Technology. Thermolite fleece traps air and moves moisture to keep you warm and dry with minimal weight. Anti pill construction looks good for the life of the garment. Soft, breathable, and fast drying. Tagless for extra comfort. Fabric provides UPF 50 sun protection, shielding skin from harmful ultraviolet rays. Anti microbial treatment for odor prevention. Terramar Warmth Factor 3.0. Import.