Molehill Boys / Girls Long Underwear Base Layer Top - Infant to Big Kids 100% Polyester Made in USA and Imported Girls and boys long underwear base layer shirts GREAT FABRICS: Made from cocona fabric that uses natural technology derived from coconut shells. Coordinate with our long underwear bottom pants. FABRIC FEATURES: Provides moisture control, odor resistance and UPF 50+ sun protection COMFORT: Flat lock stitching to minimize chafing, a regular fit to move freely EASY CARE: Machine wash. Tumble dry.