The Windermere Warmer attaches with a rear 'envelope' slipping over the back of the seat. Dry, warm and snug, made from waterproof 4 oz PU nylon and a warm fleece inner; open ended to allow you to put your feet round the tiller. One size up to waist 53 inches (clothed) . This garment zips right up to chest level. We cannot tape-seam the placket so we are not able to warrant this garment 100% waterproof , but very little moisture can be expected to get through the placket sewing line .Available in Burgundy or Navy.