Key benefits credalast nylon or credalast comfort as was once known is very smooth and easy to apply and is known as one of the most comfortable medical compression hoisery available in the uk below knee compression stockings uk compression hoisery class 1 14 17 mmhgthese stockings are a truly classic style with such great all round properties they used not only by the nhs but by medical professionals across the uk these stockings also cost less in comparison to other brands key properties