Children Fridaze 100% Linen Face Mask incl. one PM 2.5 Filter - Sand (Pack of 5). Best Linen Mask Ever Made. [Best Comfort] Most Breathable Fabric Mask [Best Fit and Style] Adjustable Ear Clip on Elastic, Modern Streamlined Design and Sewn In Nose Strip to Fit Face Shape [Best Construction] Handmade with Unparalleled Fridaze Tailoring, Constructed to Maintain Shape Wash After Wash [Best Natural Fabric] Why Linen NOT Cotton? Linen is More Breathable with Wider and Stronger Fiber Than Cotton, Environmentally Sustainable, Thermo-regulating, Hypoallergenic, UV Resistant Carbon filtration system keeps out dust and small particles with 2.5 PM filter pocket Dimensions: Approximately 7.5 inches width by 4 inches height (suitable for ages 3-10) The replaceable filter cannot be washed. Recommend replacement of 2 times a week. CARE INSTRUCTIONS: Machine wash and dry on gentle cycle. Hand Wash is recommended for prolonged use of product.