The thin, extremely lightweight cellulose fibre liner contains refreshing essential oil capsules for a comfortable allday feel. The feet do not overheat or get cold, they stay dry and fresh. The nonslip bottom layer holds the liner in place. The refreshing effect lasts 57 days. Especially recommended in summer. For frequent replacement of 3 pairs per pack. Sizes: 36/38, 39/41, 42/44 (triple numbering)