Size Regular of the Wonder Care sacroiliac belt or sciatica pain relief brace fits hip circumferences between 32 and 47 inches, while size XL/XXL fits hip circumferences between 47 and 56 inches. The sciatica back brace, which is unisex in form, fits just above the hips. View pictures of sciatic nerve braces as an example. You can wear this si joint belt for men and women belt over or under your clothes to relieve joint pain likewise called a hip brace for women and men and hip support brace and hip compression wrap.