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This is a unisex heat activated color changing tshirt for boys and girls that changes color when you touch it or by your surrounding heat. These are stylish and cool fashion childrens short sleeve tees in blue to white, purple to pink, green to yellow and pink to blue. This is an amazing shirt for a boy or girl for indoors, outside and all seasons. The blank clothes change color if you place your hand on them and change back once they cool down. They come in sizes Extra Small XS, Small S, Medium M, Large L and Extra Large XL. These Smart Wear for children are a vast improvement from Hypercolor in the 90s. These tshirts are machine washable and dryable for many years of fun. These are the coolest and hottest shirts a kid could have. You don't need the sun to have color changing fun when you're wearing Shadow Shifter. Color shifting technology.