SPT stands for Serpent Performance Team, to seperate the race and hobby/RTR activities more stepwise.The t-shirts feature a large SPT graphic on the front, which allows space to add additionals sponsors as needed. On the rear a nice smaller Serpent racing team logo.The t-shirts come in the most common sizes ranging from XS up to 3XL, and are made off a nice fitting cotton-nylon mix.1902 Cap SPT - Serpent black190246 T-shirt SPT Serpent black (XS) 190232 T-shirt SPT Serpent black (S) 190233 T-shirt SPT Serpent black (M) 190234 T-shirt SPT Serpent black (L) 190235 T-shirt SPT Serpent black (XL) 190236 T-shirt SPT Serpent black (2XL) 190237 T-shirt SPT Serpent black (3XL)