Hydro-Fit 176 Black Wet Vest Air Collar WET VEST® Therapy Collars provide comfortable and secure flotation to safely support the head and neck when the body is in horizontal and vertical positions. Collars feature adjustable Velcro-like straps for fitting around the neck and attaching to our WET VEST II flotation vest. The high quality 100% polyester cover is soft to the touch and durable against wear and fading in chemically treated pool water. The Air Collar features an inflatable air bladder.