Axolom STP Boxer is a soft Breathable Cotton STP Packing underwear for FTM Trans Guys, Non-Binary, and others. It is a non-functional FTM Packing boxer. It means the boxers keep the dick in one place. It's not movable underwear. The packing underwear features an anti-roll middle “O Layer”. The button fly is made for packing an STP Packer (It can be a soft packer or Stand to Pee Prosthetics). Now STP Packer can be used without a harness. Synonyms: STP Button-Fly Underwear, STP Brief, FTM STP Packing Boxer.  The Axolom STP Boxer is very comfortable with Axolom Uncircumcised or Circumcised Thinker STP Packer. It is also designed for Axolom Handy, Axolom Astro, and other STP Prosthetics. A Preview of Axolom STP Boxer: Introduction:  The Axolom STP Boxer underwear has two layers. The outside layer shows two buttons that allow a person to STP (Stand to pee) in front of public toilets or private spaces through the FTM STP Packer. The inside layer(O Layer) keeps your STP attached to your body. It also has a layer of keeping the scrotum.   The STP Packing Underwear works for specially Thinker, Handy. It also works for other STP packers as well. Some STP packers may not suitable for it.  More Information: AXOLOM STP boxer work with most of our Stand To Pee Prosthetics, which have a shaft diameter of less than 1.5". ( DOES NOT fit the Homerun, Hoodie).   Size Chart:  XS (27"-29") S (30” - 32”),  M (33” - 35”),  L (36” - 38”),  XL (39” - 41”),  1XL (42” - 45”),  2XL (46” - 49”),  3XL (52” - 55”)   Material: 95% Cotton, 5% Spandex.  - 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.) - Wide comfortable waistband, with the underwear itself made from high-quality fabric to last wash after wash. Color: Black, Navy Blue Wash Cold, Tumble Dry or Medium Low.