This black t-shirt features a humorous math joke centered around crossing a mosquito and a mountain climber! The design presents the question: "What do you get when you cross a mosquito with a mountain climber?" The answer? "Nothing! You can't cross a vector with a scalar." A clever illustration depicting a mosquito and a hiker adds to the fun. The shirt appears to be made from a comfortable, soft fabric, perfect for casual wear. It's a great conversation starter for mathematicians, hikers, or anyone with a quirky sense of humor. Wear it to school, hiking, or your next math club meeting!