I do like the softness and the style but the pair I received needs more elastic/stretch. They pull on fine but then do not stay in place well. A size smaller would not make sense either. I am a cyclist/speed skater (re: hips & butt) that has gone up a size recently due to weight gain from injury and I was looking for under clothes to fit until hopefully I can return to normal weight. I bought several different brands in case one style was better for my figure than others. Sadly this was the losing item. All the others had enough stretch that once on, they stay against my skin and in place as they should. Best way I can describe the lack of elastic in these is if you've ever kept anything long enough with stretch that will still expand but no longer retreats back to it's initial state.I bought one Bambooty thong a few months ago, and it is the most comfortable workout thong ever. I finally sucked it up and ordered another one (at $14 a pop, they're not cheap) in the same size, and it is significantly smaller. The new thong fits tight and uncomfortable and is unwearable. Both thongs pictured are a size small and are obviously different dimensions.I'm marathon training now. I used these one three separate occasions to give them a chance, and after a long run, I have come to hate them. Complete waste of money. They were loose. I'm 5'9" and 145 pounds. I bought a medium, as recommended through other reviews. I found them without elastic, they slipped on my hips (and I have hips and a butt), and they did not stay in place in the groin area. Irritating during a 10 mile run. I was tempted to throw them in the trash at mile 3.I love everything by tasc. This thong is loose, though. I always order size large because of a large butt, but I wish I chose medium for these.It doesn't seem like you'd be able to return underwear, but I would if I could. The material's texture is about the only nice thing about this product. Not only were they too large, even though I ordered the same size in a different product by the same manufacturer (with which I am very pleased), they have little stretch. What this translates to during wear is that they droop, shift, and bunch up. If I'd realized these were going to be so very different, I would never have ordered them. If you're going to order these, order at least one size smaller.These are absolutely horrible. I have large hips so I bought a large. They do not rise high enough for a thong and they kept falling down through out my workout - A size smaller would be ever worse and I would be wearing them around my hips so they would absolutely roll down. Wish I could get a refund or exchange, but cant since I already wore them.These were larger than I thought they would be.They streched when Girl friend put them on.