These are size 8.5, but they run extremely small. I am a TTS 7 and they fit me perfectly, except the ankle isn’t as tight as I’d like it to be. Inside measurements are approximately 23.5 cm x 6.5 cm. Web description: Are you looking for the ultimate leather bootie you'll live in year-round? Well, BIA may just be the bootie for you! Handcrafted with vegetable tanned leather, BIA features micro perforation detail, a beautiful decorative front, whipstitched leather edges, unique back lacing, and an easy-on side zipper. - Chrome free, vegetable tanned leather Handstitched accents, decorative back laces and handwoven edge detail - VIBRAM toe and heel plates - Leather stacked, 2.5 heel - Made in Mexico