Follow Instructions on the package and put it in the dryer, the wrinkles will disappear and it will take shape. You will be pleasantly surprised that it suddenly changes.
High Quality Fabric 30D High Elastic Memory Sponge A with true resilience and support, Arctic velvet cover, and antiskid bottom.
Large Space Enough space for pets to roll freely. Cute rabbit appearance is integrated into any decoration style.
Removable roof, convenient for installation and cleaning. Machine washable.
Sizes:

Small: 15.4x12.6x13.4 in recommended for pets within 8 lbs. 

Medium: 17.3 inx14.2x15.4 in recommended for pets within 16 lbs.

Large: 19.3x15.4x14.2 in recommended for pets within 31 lbs.