Spare Gel-Packs for Zandonà Thermoboots. Sold in pairs. WASHING INSTRUCTION OF THE GEL-PACKS: Remove the Gel-Packs from the THERMOBOOT; Do not put the Gel-Packs in the washing machine. Clean them only by hand with mild soap and warm water. Dry with a towel and store them in a cool place. Do not use if Gel-Packs are damaged (e.g. if the gel is pouring out of the pack). In case of damage, replace the Gel-Packs with new ones.