Speedo Women's One Piece Swimsuit with Long Sleeves & Front Zip - UV Protection Swimwear for Lap Swimming, Surfing & Water Aerobics

I'm 5'5" and 115 lbs. I ordered both a small and medium and ended up keeping the small. This suit is great for summer surfing! UV protection where I need it most. There is no bra lining so I wear a bikini top underneath. The silicone strip along the rear keeps the suit from riding up the cheeks. I do wish the torso was a bit longer, as I feel it tugs a bit, but I often fall between size small and medium and wanted this to fit snuggly for swimming and surfing. If you're any taller than I am, or have a long torso, you'd probably want the medium.