Credalast Flatbed Cotton Kneecaps are perfect for those who need a Medium compression solution for Knee support, UK Compression Class 2 18-24 mm Hg. Key Properties Comfortable Perfect for Sensitive skin Easy to put on Cotton Content for those with alergies Always remember to buy two, one to wear one to wash.NHSYes these stockings are available on prescription through the NHS, however with increasing prescription costs & to save time, why not just buy them here?WARNING! Always consult a Medical Professional before wearing Compression Support hosiery.