I've practiced 4+ days per week for two months on my Manduka extra long... still too slippery to use once you have any sweat on your feet or hands. I tried toweling it off, but now I'm just using a yogitoes towel on top (regular cotton towel slips off.) It's winter here, so once we get warmer out I'll try leaving it out in the sun, but seriously I may just have to return this or figure something else out.