Ozone Trousers (Unisex) The Ozone undersuit trousers have been developed to be easy to get on over the arctic legging & to offer exceptional comfort & protection during the dive. The trouser leg opening has a slight "boot-cut" so that the trousers can be donned over footwear & worn over the top of boots. A slight "break" in the knees gives greater ease of movement. Low profile D-ring belt, is comfortable irrespective of what is worn underneath.