With such a huge range of designs and styles for masks in the market, we cannot guarantee a MistyClip will fit or be effective with a material or homemade mask. MistyClips were designed to fit the commercially-available 'blue' surgical masks, but can be fitted to some material masks provided the thickness of the top seam is no greater than 1mm and provided the recommended fitting technique is followed.
Also, please be aware that as MistyClips are made from a corn-starch derivative fibre, they aren't as robust as the typical hardened 'petroleum-based' plastic used elsewhere, so they won’t tolerate too much flexing! We cannot offer refunds or replacements for breakages that occur while fitting or removing a MistyClip.