These Mattel Hot Wheels Monster Truck 2 Piece Flannel Pajamas in size XS (4-5) are perfect for young boys who love the Hot Wheels brand. Made of cozy cotton knit fabric, the multicolor pajama set features long sleeves, a button closure, and a fun monster truck theme. Ideal for sleep during any season, this pajama set adds a touch of excitement to bedtime routines. Perfect for young boys who enjoy playing with Hot Wheels vehicles and want to sleep in style.