AXOLOM STP Trunk with Curtain is a soft Breathable Cotton STP Packing underwear. The packing underwear features an anti-roll middle “O Layer”. The button fly underwear is made for packing an STP Packer (It is perfect for Stand to Pee Prosthetics). It enables a user to have a 3-in-1 option. Now STP Packer can be used without a harness. Synonyms: STP Trunks Button-Fly Underwear, STP Brief, FTM STP Packing Trunks, FTM Harness.   AXOLOM STP Trunk with Curtain is packing underwear for STP Packers. You can pack any of the Stand to Pee prosthetics. It can't be packed with FTM Soft Packers because FTM packers are soft and not eligible for this packing with STP Trunk. It looks naturally well and it is very comfortable.  Introduction: Packing underwear is an essential part of trans men's life. The Axolom Packing Jockstrap underwear has an "O ring band" inside for holding a packer gear and also has a little pouch for holding an FTM Packing Gear. It has a option to hold the packer without touching skin. In the beginning, we build various soft FTM packers and some Stand to pee prosthetics. Then we thought to make some essential products such as STP underwear, and FTM packing underwear.      Size Chart:  S (29” - 32”),  M (33” - 35”),  L (36” - 38”),  XL (39” - 41”),  1XL (42” - 45”),  2XL (46” - 49”),  3XL (52” - 55”)   Material: 95% Cotton, 5% Spandex.  Wide comfortable waistband, with the underwear itself made from high-quality fabric to last wash after wash -Button fly opening to easily access the shaft -Soft fabric-covered O ring to keep the shaft of your packer/STP in the natural hang position.  -Interior elastic loop harness, hold your STP secure and in a natural position. ( Can be cut off if you think it's unnecessary.)