Wool sports bras are where it’s at! No matter how much you sweat they never smell bad! Perfect for hiking, working out, camping, backpacking, extended travel, etc. This one has been worn once and washed once, I ended up needing a different size. From the website: Material [face fabric] 100% merino wool [panels] 72% polyester, 28% merino wool Sports bra designed for cold-weather outdoor pursuits Merino wool provides thermal regulation and odor resistance Synthetic panels add extra breathability in key areas Fine 19 micron fiber merino is itch-free and soft on skin Wide elastic underband provides medium support