Mobile CoolingA(R) Ice Packs with HydrologicA(R) Plus technology with rapid action to bring the core temperature back to safe levels in minutes. Ice packs are made with pure water that can be cooled by refrigeration or Freezing to provide you with long lasting cooling. Designed specifically to be used in conjunction with our full line of HydrologicA(R) Vest garments to extend your cooling with additional ice packs. By removing latent heat through the evaporative process and dropping internal temperature cooling for the skin. Our ice packs ensures lasting performance to keep your cool for hours. Ice Pack Features: 3 removable Mobile CoolingA(R) Ice Packs Made with Pure Water Non-Toxic Freezable Pack Reusable 100% polyester ice pack sleeves ensure easy slide into the HydrologicA(R) Vest internal pockets Unisex Includes: (3) Ice Packs (3) Ice Pack Cloth covers Vest not included.