5 oz. 100% combed ringspun cotton 1x1 baby rib; White is sewn with 100% cotton thread; Heather is 88/12 combed ringspun cotton/polyester 1x1 baby rib; 1/4" single-needle binding on neck; Easytear™ label; Double-needle hemmed ruched sleeves; Sideseam construction; CPSIA compliant tracking label in sideseam