This is a really nice blanket. Waterproof for sure as my girl was just outside in the rain. She's a very broad chested mare and wide around the belly, so when I measured it was at about 80'ish. The closest I could get before she decided she didn't like the measuring tape. I ordered an 81, but I'd order the next size up if I get another as it's a bit tight through her chest. The top buckle is at the widest and if the blanket was left on for a week or 2 straight, she might get some rubbing at the shoulder area.Either way, the quality is great! The neck fits up high enough, not just at the withers, but up a bit more.It's impossible for ANY manufacturer to make a blanket that's perfect to fit every horse as they're all different, but this one is very nice. The gussets down the front allow for good movement.I wish the tail flap was removeable, but it's fine.I'd definitely order this brand again. Very warm, fluffy, the purple color is beautiful and it's just an all round great purchase!