HyperKewl Evaporative Cooling Vest for Kids Simple V-neck w/zipper closure; work for a wide range of people and uses Comfortable, quilted nylon outer with HyperKewlpolymer embedded fabric inner, water-repellant nylon liner and black cotton-poly elastic trim Many Sizes Available Child Age Specific Size Will Not Swell or Bulge, Will not become slimy or leak toxic chemicals