Relates to bra size range: 30-32: This was the original design:sloped shoulders,or mobility problem: This Strap-Mate attaches to bra straps in the back and the strap-mate straps are crossed in the back and brought to the front to connect with an interlocking clasp easily... Offered for women with mobility problems,for recent post-mastectomy clients who have trouble with initial pain management. Most Strap-Mate users (about 99%)are able to convert to the straight back design as their healing time reduces pain and improves their mobility.