Hello, i live in Canada and am looking for some replacement feet for my Air-Trekkers, which i believe is the North American Equivalent. I found some on a website and they were 25 bucks then when i went to check out they wanted $22 more for shipping. Which is BS because i can ship anywhere in North America for under 8 bucks flat rate small box. I'm wondering if there are any quality ones in the UK. I used Tyre Sox for a while but they became loose and kept sliding to the sides.