The Heveya® bolster is made from 100% organic latex! Hugging it can straighten the back and promotes good spinal alignment while sleeping. The latex bolster is durable and long lasting. Its natural elasticity will give you excellent support night after night. The bolsters are encased in organic-cotton-padded bamboo cover that are dry-cleanable which ensure hygienic sleeping environment during the entire lifespan of the bolsters, making it also for dust-mite resistant.