The inserts are specially designed to be safe and to easily fit into the comfy tails harness.
Cooling the Kumfy Pax
Warming the Kumfy Pax
The cooling and warming effects should last from 1-2 hours depending upon conditions. We strongly recommend purchasing an extra insert so you can change them out for longer walks.
Dogs have a higher body temperature than we do (101°-103°F), so to help regulate body temperature they need more efficient and concentrated cooling in the summer.
If between sizes, consider the larger size. If your dog has a stout build, deep chest, or is overweight, consider going up one size. If your dog is long-backed, like a Dachshund, consider a smaller size.