These stroller bassinet sheets are made of the finest 100% cotton `Organic jersey knit` material. Sheets are made with deep pockets and are elasticized around the entire edge which prevents it from slipping off the mattress, thereby keeping your baby safe. These sheets are so durable that they will last all through your baby's growing years. We're called SheetWorld because we produce the highest grade sheets on the market today. Color is a Solid White. Fits standard crib mattresses measuring 13 x 29 inches.