These are insoles to accompany Wild Bird Society of Japan wellington boots.
Extended periods spent walking on pavements or hard tracks while wearing rubber boots can cause discomfort to which these insoles can provide an answer. Especially adapted to the WBSJ's boots, each insole features a '3D cushion' for your comfort, and an anti-odour mechanism for everyone else's. They can also be a solution to provide a better fit.
For sizing the 'Man M' fits at LL (27cm) boot, 'Man L' fits a 4L (29cm) boot, 'Woman M/L' fits a M (25cm) boot. (For size conversion please see the WBSJ wellington boot page, elsewhere on the site).