Sir Cumference Phone Cases - iPhone and Android

Description: Introducing the "Sir Cumference" t-shirt, a funny and trendy tee. Wear it with a smile, showcasing your sense of humor and trendy vibes.

Description: Introducing the "Sir Cumference Fat Knight" t-shirt, a funny and trendy tee.

Description: Show off your love for geometry with this clever knight design. Perfect for math teachers, students, and nerds who appreciate a sharp wit and circular logic.

Description: Which knight was responsible for designing King Arthur's Round table?

Description: Medieval geometry for math nerds to history teachers (and everyone in between!)