That's the patented technology behind the
phase change material used in our Cool Packs.
Until now the only
answer to heat stress was to wear an ice or gel cooled vest. That meant
having a freezing cold pack against your body - too cold to be comfortable.
To alleviate discomfort, undergarments were needed as a barrier, defeating
the purpose of the vest.
With phase change
material technology, you'll stay cool and comfortable at a temperature that
feels natural to your body and skin. So comfortable, in fact, that our
products can be worn directly against your skin for optimal cooling.
Washable, no shrink outer shell made from a rugged cotton twill or
fire-retardant Bannox is the first layer of shielding from ambient heat.
Insulating layer minimizes the absorption of ambient heat by the Cool Packs.
phase change material, Cool Packs literally pull heat from the body, while
maintaining a comfortable temperature of 65 F.
The semisolid thermal heat absorption material in the Cool
Pack is designed to chill to 65 F. Once the material phases solid, it can
be placed directly against your skin and used to cool the body. The
material actually absorbs heat generated by the wearer.
As the Cool Pack
absorbs heat, it will begin to change phase from a solid to a liquid.
Because of the constant temperature behavior of phase change technology,
the Cool Pack maintains 65 F during the entire transition. The process can
take several hours and is a variable of ambient temperatures, workload, and
To quickly recharge the
Cool Packs, simply place them in ice water for 20 minutes or in a
refrigerator for 35 minutes. The Cool packs are fully phase changed when
completely solid. The Cool Pack continues working until the phase change
material is completely liquefied again. Cool Packs continue to recharge for