Fuji Daruma the gold standard brand for Kendo Uniforms has manufactured a light weight and moisture wicking chin sweat protector designed to go inside your Men. 
 
Note: One size that fits all, it is highly recommended to wear one of these if you are a beginner in Kendo, this will help reduce wear and tear in your Men as well as keep it from absorbing sweat and dirt whilst training. They are machine washable and dries super quick it is not recommended to use fabric softener or tumble dry.