These are all double layer and washable.
Width excluding elastic
Small 16.5-17cm (Nos 12-18)
Medium 17.5-18cm (Nos 5-11)
Large 18.5cm (nos 1,3,7,8,10)
XL 19cm (nos 2-4)
The profit from the sale of these masks will go to charity - we have already raised over £2000 for extremely vulnerable children in Zambia where we have strong links. 
Please note that now we are back open we are trying to update the stock of masks showing on the website regularly, but there may be occasion where the specific mask you request has sold out. If so we will contact you with an alternative or offer a refund. Thanks for your understanding.