Challenge yourself to the next level of adventure knowing the Under Armour Base 4.0 has kids covered in extreme temps. When applying that extra layer of warmth with the Base 4.0 Crew Long Sleeve layer, it provides any kid with wind and water resistant protection that dries quickly as the moisture transport keeps ventilation flowing and the 4 way stretch makes for unrestricted movement. 81% Polyester and 19% Elasterell - Offering a soft stretch for boys on the move., 4-Way Stretch Construction - This top won't let anything hold young shredders back., Anti-Odor Technology - Traps odors, leaving them virtually undetected, even if laundry is a day or two behind., Moisture Management System - Material will wick away the sweat when kids start to heat up., Quick Drying - Fast drying fabric allows kids to warm up if wet at a quicker rate., Raglan Style Sleeves - Reduces any possible chafing from layers or a backpack., Fit: Tight, Warranty: Lifetime, Wind Protection: No, Material: Synthetic, Weight: Heavy, Type: Top, Wicking Properties: Yes, Water Resistant: No, Recommended Use: Snow, Antimicrobial: Yes, Anti Odor: Yes, Quick Drying: Yes, Moisture Wicking: Yes, Model Year: 2022, Product ID: 620457, Model Number: 5032588-001 S, GTIN: 0193579219208