The Superfeet Blue Trim-To-Fit Insole has been designed to be an all-rounder & improve a variety of footwear. The versatility & biomechanical shape have made the Blue insole one of the most popular. Its heel cup helps to position the heel properly to absorb impact & the Antimicrobial coating helps to reduce the growth of odour-causing bacteria. If you want an insole that covers all areas then look no further! Features Medium profile insole Antimicrobial coating to reduce odour Gives intermediate support Best for most types of low & medium footwear Even works on some if you can't remove original insole Fits into most footwear Deep structured heel cup Long lasting support Specifications As with all new products, a break in period may be required. We advise you wear the products for 1-2 hours on your first day & build this by 1-2 hours until you are completely comfortable with the products. For some people this may take a week or two. It is not uncommon to feel the Superfeet products towards the back of the arch, in front of the heel. This is just the unique Superfeet shape doing its job. Please be aware of the 60 day money back guarantee if you are not completely happy with the products.