This is a multi-use stretch vest that can be used while walking, running, or after activity. Excellent for lowering body temperature when soaked in cold water for a limited time; Helps retain body heat when needed at lower temperatures for a limited time; Can be put under harness for avoid chafing on the chest;Ensures the dog's visibility in daylight and in the dark (Axaeco reflex logo on the left side);UV protection vest;Made of elastic Lycra;Extremely flexible to perfectly fit the body; Colour: royal/reflex blue;Neck sizes: XXS = cm 16+, XS = cm 18+, S = cm 21+, M = cm 25+, L = cm 29+, XL = cm 34+, XXL = cm 39+