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.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..