Microfiber,polyester Exact Mini Crib Fit: Designed specifically for 38" L × 24" W portable/mini cribs. Important: Not compatible with standard 28" × 52" full-size cribs Premium Soft Microfiber: Made from 100% microfiber that is ultra-soft and gentle on baby’s skin, while being durable, wrinkle-resistant, and ideal for frequent washing Thoughtful, Baby-Safe Design: Features a 10" drop with smooth hem and split corners for a secure fit that stays in place and reduces snagging risks Easy Care & Long-Lasting: Machine wash cold with like colors; tumble dry low. Maintains shape and color with no shrinkage or fading after repeated washes Trusted Brand Quality: From an established Amazon seller since 2007, specializing in baby bedding with consistent quality parents can trust