【ODOR 】 When you open the package for the first time, you will smell something. Don’t worry, it’s the odor of natural latex. Just put the mask on ventilated place, the smell will disperse. 【MATERIAL】 100% natural latex (environmental and non-toxic). Advanced manufacturing technology. 【SIZE】 Free size. (One size fits most children and adults.) 【WRINKEL】 The small packaging box may cause slight deformation on the mask, just use something to hold the mask open to let it recover its shape. 【AFTER-SALES】 If you are not satisfied with our products , just return them for a full refund.