The same A4 cooling interlock the grown-ups wear, cut for kids. Wicks sweat, resists snags, and carries a UPF 44+ rating for long afternoons outside. • 4-ounce, 100% recycled poly interlock • Moisture-wicking, stain release, odor-resistant • UPF 44+ sun protection • Snag-resistant • Reinforced shoulder seams • Tag-free label • Youth sizes XS-XL (chest 27-38") Runs in White only — the adult Light Yellow is not made in youth sizes.