The thin, extremely lightweight cellulose fibre liner contains refreshing essential oil capsules for a comfortable all-day feel. The feet do not overheat or get cold, they stay dry and fresh. The non-slip bottom layer holds the liner in place. The refreshing effect lasts 5-7 days. Especially recommended in summer. For frequent replacement of 3 pairs per pack. Sizes: 36/38, 39/41, 42/44 (triple numbering)