EUC women’s OS LULULEMON Wunder Train Hat in Heritage Camo Wash Juniper Green Multi / Black We combined our fastest-drying fabric with our unique SurroundStretch™ fit technology, and added a discreet ponytail opening to manage your mane while you train. fabric * Four-way stretch Everlux™ fabric feels smooth and cool, wicks sweat, and dries so fast it's like magic * Lined with moisture-wicking, quick-drying mesh fabric features * SurroundStretch™ technology uses flexible fabric panels and a stretchy, low-profile sweatband to create a snug fit without constriction * Hidden ponytail opening holds your hair back and lays flat when not in use