About This Outer: 100% Cotton Lining: 50% Viscose & 50% Cotton Imported 2.5 TOG FOR COLD NIGHTS: Designed for colder sleeping environments, this 2.5 TOG sleep sack provides extra warmth to help keep baby cozy and comfortable during winter nights — no loose blankets needed. DETACHABLE LONG SLEEVES FOR FLEXIBLE WARMTH: Long sleeves add extra warmth for colder nights and can be easily removed when room temperature rises, offering adaptable comfort through fall and winter. BUILT-IN TEMPERATURE STRIP FOR EASY CHECKS: Features a chest temperature strip that helps parents quickly check baby’s skin-contact warmth at a glance, making it easier to adjust layers without waking baby. SOFT COTTON WITH PADDED WADDING: Crafted from high-quality cotton with inner padding for added insulation. Soft, breathable, and gentle on baby’s skin while providing reliable warmth. EASY NIGHTTIME DIAPER CHANGES & CARE: Two-way zipper allows quick diaper changes without fully undressing baby. Zipper guard protects baby’s delicate skin, and the sleep sack is machine washable for easy everyday care.