The Solid Ribbed Black Convertible One-Piece from Posh Peanut embodies understated elegance—a timeless essential that grows with every stage. Crafted from ultra-soft Päpook® viscose from bamboo, this refined piece is breathable, lightweight, and tagless for sensitive skin. The 2-way zipper ensures effortless dressing and diaper changes, while convertible mittens (newborn through 0–3 months) protect delicate hands. Convertible footies with designer grips provide secure traction across every developmental phase. Not treated with flame retardants, it reflects Posh Peanut's commitment to thoughtful design. Machine washable and tumble-dry low for easy care. This best-selling one-piece is the heirloom staple discerning parents return to season after season—versatile, durable, and never loud. Ribbed construction in 95% viscose from bamboo, 5% spandex.