Cooling Dog Harness by Ruffwear Advertised by Ruffwear to be a three-layer construction absorbs water and promotes evaporative cooling. More information can be found on Ruffwear's website. This is a size Small - dimensions according to Ruffwear is 22-27inch girth. My dog could not get used to the harness feeling, so nearly brand new. It has been used a couple times, so a spots from water marks. Harness has been hand washed.