Helly Hansen Dinghy Smock Top The waterproof, breathable Helly Tech Protection main fabric will keep you nice and dry against waves and showers. Helly Hansen's Dinghy Smock Top is made with an elastic waist construction that provides a great fit and breathing room. The large front mesh pocket with zip closure is great for storing loose items in. This Smock Top's adjustable neck collar provides ventilation and an even better, more customized fit.