These unisex onesies are made of 100% micro-polar fleece and are so durable, they will last for years. Fabric is higher quality than other fleece pajamas and will not pill when taken out of the dryer. These pajamas button up the front and have non-slip soles. They even have a fun and convenient drop-seat option! You can order your adult onesie pajamas today, with or without the butt-flap. Onesies have been featured and reviewed in media outlets all over the World.