Please understand. Without this I would NOT have completed the Ironman world championships. I had done a lot of long rides in the basement with manageable foot numbness. 2 weeks before the Ironman I got on my Tri bike— and couldn’t go past 50 miles. I desperately spent 300+ dollars on last minute orthotics. No better. I found these last minute and did the 112 mile bike with my feet feeling amazing.