M size thumb support, provides a comfortable fit. The box is damaged, so I will dispose of it. Please comment if you want it. - Brand: SIGMAX - Product Name: Facilitated Supporter - Size: M - Application: Thumb support I purchased this at a medical institution when I had tenosynovitis, but I hardly used it. Please understand that this is a used item stored at home before purchasing. No pets, no smokers. Thank you for looking.