The Regular Cut Butterfly Harness provides maximum anterior support giving security, safety and freedom of movement. Choose Harness Size to match Frame Size (Small, Medium, Large). Slim Cut Butterfly Harness performs the same positioning function as the Regular-Cut Butterfly Harness. The Slim Cut Butterfly Harness is an alternative especially designed for larger female users. The Slim Cut Butterfly Harness is available for Frame Sizes Medium and Large ONLY. Choose Harness Size to match Frame Size.