Transformers Merchandise - Intimo specializes in quality, sleepwear for men, women, boys, and girls. Intimo is the industry leader in pop culture products and apparel that deal with the entertainment industry in comic books, tv shows, movies, music, sports, and what's trending. Sizing / Soft Fabric Blend - This pajama set is made of a super-soft 100% cotton blend. It is listed in boy's sizing. For visual reference the model in the photo is 52 inches tall and is wearing a size 7/8. Classic Character Design - This Transformers classic pajama set features the character costume design of Optimus Prime for your little ones' sleepy nights! It's for everyday wear! Features - An elastic stretch waistband on the pants and a classic long-sleeved fit on the top! The sleeve and pants cuffs are elastic as well. Gift For Any Occasion - Magnificent design for everyday use. This pajama set is designed for your little kiddo in mind, and its soft and comfy fit is for everyday wear and curling up to dream about fighting with the legendary Transformers! Transformers, more than meets the eye! Now's the time for your little one to show how much of a legendary fan they are! This Transformers classic pajama set features the character costume design of Optimus Prime for your little ones' sleepy nights! Dream about being an Autobot with Bumblebee and all his human loving friends and saving the earth from the Decepticons and Megatron. Soft and comfortable and made in boys sizing, please check our sizing chart for best fit.