Long-sleeve Onesie. Materials 5.0 oz., 100% combed ringspun cotton, 1x1 baby rib Heather is 93/7 combed ringspun cotton/polyester White is sewn with 100% cotton thread More Info Flatlock seams. Double-needle stitched rib binding on neck, shoulders, sleeves and leg openings. Reinforced three-snap closure on binding. CPSIA Compliant - tracking label in side seam.