This caving t-shirt features a spoof of the Harry Potter films and books by J.K. Rowling, instead saying "Hairy Potholer and the dark caves of Derbyshire" in a Harry Potter-like typeface. Perfect for all you Hairy Potholers out there who like to spend your time squeezing through small dirty damp holes miles underground! This is a 100% cotton black Potholing t-shirt with a custom yellow transfer print.