These thighs are of a thick polyester-feeling material that feels very sturdy and not easily tearable. It's good for spring/fall but too warm for the summer. The design gets stretched out and thinner when wearing it, so it's not as well-defined as it looks in the image.
I wouldn't recommend these for people who wear over a US size 4, since I usually wear size 6 and was not able to get these comfortably up my thighs. This isn't the fault of the thighs since they are labeled free size, but heads up to other people who wear similar sizes.
Thank you for your detailed review. We're glad to hear that the material is sturdy and suitable for cooler seasons, but we're sorry to know it didn't fit as comfortably as you'd hoped. Your feedback about the sizing is valuable and will help other customers make informed decisions.
We appreciate your understanding and hope to offer items that better suit your size in the future. :)