This Terramar 2 Layer Authentic Thermal 2.0 Long Sleeve Crew will keep your little one warm and comfortable when it"s cold. Product Features: Crew thermal Midweight Ec2 Qwik-Dri comfort technology Anti-microbial Rapid moisture management Keeps you dry, warm and comfortable 2 Layer construction traps air for better insulating UPF rating 25+ Double fleece construction 100% Polyester