Our Short-Sleeved T-Shirts are 100% Ring-Spun Combed Cotton, 4.8-5.3oz with a Rib Set-In Collar. They are Double Needled Hem Sleeve & Bottom. All Shirts in this Collect ion Fit True to Size. If Your Child's Size Falls in the Middle of an Available Size (ie. 5) We Suggest Ordering Up a Size.