Here is a vedio on Youtube shows how the liquid insoles works. 

Hi, we are Aybroad Sports LTD Co., -- best liquid filled insoles.  We are manufacturing and offering best liquid insoles to worldwide, with very high reliable qualitya and satisfied services. 

The 10 Best Liquid Insoles For Massaging, according to sheknows, are:

Here is our brochure of our liquid insoles items, including some information that customers maybe interesting.