The material of these is very smooth, and design of the crotch pocket works well; no ill conceived or flimsy opening. I also found they fit to size, unlike some the other reviewers. They are carefully made and sewn. However, the fabric is just a little too smooth , which makes them ride up a little - they are a 5% synthetic/95% cotton mix. The previous model was 100% cotton and the fabric seemed more substantial - no riding up and perhaps better durability.&nbsp;<a data-hook="product-link-linked" class="a-link-normal" href="/B001ULDNC0/dp/B001ULDNC0/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">B001ULDNC0</a>

Followup 7/26/13. The durability on these is good. They are still as good as new after 9 months of use. I'm also finding they ride up less after a few washings. Followup 1/18/16. Still going strong.