Kids weighted vest with Spiderman print. Very cute cotton pattern for our little Spiderman lovers! We use Virgin poly pellets that are sewn into vest in small pockets for even distribution. Weighted vest allow for deep pressure touch stimulation, which in turn produces serotonin, a neurotransmitter thought to be very influential on mood as well as appetite, memory, and learning. Vest helps a child feel more secure, calm and grounded throughout the day. Recommended weight of the vest should be 5-6% of the child weight. Each weighted vest is made specifically for your child. Once your child is done wearing the vest, throw it in the washing machine in cold water, dry on a low setting.