A LIGHT, BREATHABLE LAYER FOR WARM-UPS. The Jordan 23 Alpha Top is an ideal layering piece for players during practice and pre-game warm-ups. It's made from lightweight, sweat-wicking fabric with mesh through the back to help you stay cool. This product is made with at least 75% recycled polyester fabric. Lightweight knit fabric with sweat-wicking technology helps keep you dry and comfortable. Mesh back panel helps provide cooling. Motion vents at the hem allow the top to move with you.