The Cool Vest Lite, with its concealable and comfortable design is the smallest of our Cool Vest Line. It's great for people looking for the most concealable and light-weight cooling solution. This two-piece model has adjustable, two-inch elastic shoulder straps for maximum comfort and easy sizing. The six, mid-section elastic/hook & loop adjustment straps hold the four-piece, 62-degree F. phase change cool packs in place and secure against the body for maximum coolness, comfort and minimal restriction of movement.