This ultra-lightweight, breathable baby set features a long-sleeve top and matching pants crafted from premium 'Youkesi' (优可丝) lyocell fiber—sourced from sustainable wood pulp (as indicated by '木浆源')—ensuring exceptional softness and skin-friendliness for infants. The ribbed vertical stripe texture provides gentle stretch and structure without constriction, while the open-front snap closure on the top allows easy dressing and diaper changes. The pants feature an elastic waistband with reinforced seams and a slightly tapered leg for comfort during crawling and movement. A close-up inset highlights the fabric’s fine, airy weave—described as 'light and breathable' (轻薄透气)—ideal for sensitive newborn to toddler skin in warm climates or layered under light outerwear. Designed for daily wear, naps, or gentle playtime, this A-class certified set prioritizes safety, breathability, and minimalist elegance. Perfect for spring and summer use, it suits unisex babies aged 0–24 months and pairs effortlessly with socks or barefoot for indoor comfort.