STAY COOL AND COMPOSED. The Nike Precool Vest has a tight, stretchy design that holds 4 ice packs close to your body to help you cool down for optimal performance. Benefits: Refillable ice packs are easily transported and stored when empty. Tight, stretchy fabric has a close, comfortable fit that zips open. Product Details: 4 ice packs included. Body: 86% polyester/14% spandex. Panels: 100% polyester. Machine wash. Imported. Style: N1002650