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The Slingshot Harness is made of strong elastic bands. It is designed specifically for use with Number One Laboratories STPs. This includes:
The Number One STP, The Sport STP, Model E STP
It may be possible to use this harness with other STPs and soft packers, however, we cannot guarantee that it will not damage your prosthetic.
Use a measuring tape to measure the circumference around your thigh. Or use a ruler to measure the leg-hole in a pair of well-fitting briefs.
XS: 14"-17" / 35cm-40cm
Small: 17"-20" / 40cm-50cm
Medium: 20"-24" / 50cm-60cm
Large: 24"-28" / 60cm-70cm
XL: 28"-32" / 70cm-80cm
You can expect your order to ship within 2-3 business days after purchase. Print to order items, such as t-shirts, will sometimes take longer and will ship separately.
STP, Packer, Harness, and Underwear sales are final. All other returns are issued in store credit only.
Please note that for all non-US orders, you may be charged local taxes in order to retrieve your order. See our
Shipping Policies for more details.