This is the harness that prevents a pet from becoming overheated or chilled while on a walk. A pouch in the elasticized neoprene harness holds a reusable gel pack that is heated in a microwave or cooled in a freezer. The gel pack rests against the dog's abdomen and chest, helping to regulate its core temperature better than typical pet clothing without causing discomfort. Dual quick-release buckles make the harness easy to put on and remove. Hand wash. Red. For a proper fit, measure circumference of dog's neck at its widest point and its chest just behind the front paws. (1 3/4 lbs.) Extra Small. Neck 11"-13", chest 12"-16"