Vari+San Insole Lined with Hydrogel Size 3 (41/42) 2 pcs are insoles lined with Hydrogel. These insoles belong to size 3, equivalent to size 41/42 of normal footwear, which helps to protect and prevent the foot against pain and ailments. hydrogel, on the other hand, is a hypoallergenic and odorless product, with which your feet will enjoy an intense protection against the creation of particles responsible for foot odor.