Reversible, comfortable, with one or two layers of non-woven Oeko-Tex fabric sandwiched between the cotton outers (we recommend the maximum number of layers). Overhead elastic and sturdy nose wire. We are currently updating the listings to enable 2 and 3 layer versions. If your chosen mask has not been updated yet, please leave a message and we will refund £1 per layer. XL size also available, please leave a note.