Size Underbust US Weight M 27.6" - 29.5" 34B,34C,34D 88.2lb - 121lb L 29.5" - 31.5" 36B,36C,36D 121lb - 143lb XL 31.5" - 33.5" 38B,38C,38D 143lb - 160lb 2XL 33.5" - 35.4" 40B,40C,40D 160lb - 176lb 3XL 35.4" - 37.4" 42B,42C,42D 176lb - 193lb U - back design offers great air - permeability for all - day coolness. High - stretch, adjustable straps fit different body shapes, with four - row, five - back buckles for a skin - friendly fit.Seamless & No Underwire Design: "W" type 360° breast support, thin, non - marking, and non - binding. Dual cross support for a good breast shape, high side ratio to collect fat and shape sexy breasts.V - Neck Daily Design: V - neck shows collarbone and cleavage, no compression. U - back with invisible back lining wraps back fat, making it comfortable, beautiful, and sexy.Elastic Adjustable Wide Shoulder Strap: Wider straps reduce shoulder pressure. Adjustable and removable front - and - back straps. Semi - fixed cups don't shift when washing, and cup pads are adjustable.Suitable for Any Occasion: Smooth cup surface, suitable for work, leisure, light sports, parties, sleep, etc., balancing comfort, support, and aesthetics.