Nike Reversible Golf Beanie REVERSIBLE WARMTH. The Nike Reversible Golf Beanie is made with soft acrylic fibers. Its reversible design and removable pom let you change up your look. Acrylic fibers provide a soft, warm feel. Reversible design offers 2 looks. Removable pom lets you change up your look. Fold-over cuff offers extra warmth. 100% ACRYLIC