Lightweight comfortthis fabric is made from ultra- fine yarns knitted into a high- density performance fabric, creating a mask that is lightweight, flexible, and soft against the skin. 3- layer fabric constructiontthis mask is made using a special double- knit fabric construction, which allows the single piece of fabric to have a 3- layer structure, consisting of a top and bottom layer of high- density performance fabric, knitted together by a connecting layer of ultra- fine yarns. This creates a dense multi- layer structure in line with cdc recommendations, while providing the wearer a softer, thinner, and more comfortable mask. Breathabledue to this fabrics ultra- fine yarns, high- density knit construction, quick dry properties, and 3- layer internal structure, it allows for an exceptionally comfortable and breathable mask, without sacrificing the effectiveness of the face covering. Stretch fitas per cdc guidelines, a proper snug fit is one of the most important criteria for masks. By using a 15 spandex stretch fabric with a middle seam construction, this mask allows for a better fit and seal, which minimize the gaps where outside air can flow in. Please refer to size chart and video for proper fit and how- to- wear. Anti- bacterialbecause of special atb- uv yarns containing silver ions, this mask is rated 99. 99 anti- bacterial certified aatcc 100. This property is inherent to the yarn and manufactured using fda approved processes, not chemical treatments, so is safe and will retain its functionality after many washes. This material makes no claims of anti- viral protection. A uniquely designed fiber cross- section allows this mask to dry at more than double the rate of cotton fabrics. This allows exhaled moisture to evaporate much faster, reducing the hot and clammy feeling common to other masks, keeping you cooler and more comfortable.