My Cuillin Cooling dog coats (too good a pun not to use it!) are made from a soft lightweight nonwoven foam fabric that absorbs and retains water. This amazing fabric becomes really cold when activated by water. The coat will stay moist and cool for several hours (dependant on weather conditions) and the evaporative process activated by the cool fabric allows your dog to cool down more than the outside air. 

This year I am making the cooling in coats in two new colours:

Heather and Marine Blue  

The Cooling Coat is also available in a full length or a Sport version - the Sport version is particularly suited to active dogs as, although it still cools the important part which is the core organs, it is a nice tidy fit suited for movement.