NWOT - Blundstone Classic 550 Chelsea Boot - Rustic Black These are a women’s Chelsea Boot, AU/UK Size 5.5 which translates to a women’s 8.5. My honest opinion, they’re a little snug. I wear an 8.5 and would size up to a 9 to be able to wear socks comfortably with these. But like I said, please use the size guide and research before purchasing from me! PLEASE use the size guide before purchasing these, but my honest opinion (and wearing thicker socks - would be that these would be more of a 7.5/8 fit)