100% Polyester Perfectly Fit: Measuring 52 by 28 inch,our crib sheets fit most standard crib mattress and toddler bed mattresses.Snug fit up to 8 inch thick mattress and elastic all around, perfect tight stretch for sleep safety. Premium Fabric:The baby crib sheets are super soft, breathable and comfortable for any season!Made from 100% microfiber,these crib mattress sheet Tested for harmful substances according to Standard 100 by OEKO-TEX will provide a soft comfy place for child to sleep and play. Bright Pattern：Including blue dinosaur,elephants,stars patterns and navy blue 4-piece, these crib sheets for boys are vibrant, cute and perfect for a little baby boy,which makes such an adorable addition to nursery. Easy Clean:Machine washable and fade-resistant.For best long-term care, machine wash the crib sheet on cold with similar colors on a gentle cycle.tumble dry on low heat or line dry to best. Wonderful Gift: These sheets make an ideal gift! Children's bed covers are a daily necessity, making them perfect for a newborn gift, baptism gift, or a baby photoshoot. Plushii 4-Pack Baby Mattress Protector Fitted Crib Sheets 52"x28" . There are designed with cute flower and animal motifs. The fabric is tested for harmful substances according to Standard 100 by OEKO-TEX, it is soft, breathable, and skin-friendly to provide your baby with a peaceful sleep. The fabric is machine washable.