The Safety 1st Little Angel Mattress ensures that your little ones sleep time is supportive, yet very comfortable. The cover is made of rayon from bamboo for extreme softness and is resistant to stains, odors and mildew. Its removable cover is water resistant and machine washable for easy cleaning. The high density thermo-bonded core construction provides firm support to your growing baby. The Safety 1st Little Angel Mattress is lightweight and durable, lasting throughout your child's development.