Hydrocool Patch Sheet Gel (Pack of 4). Made by Hydrocool. Buy Hydrocool Patch Sheet Gel online in Karachi at Nice Super Market & Pharmacy, DHA - see the price in Pakistan and order on nicemart.pk or the Nice Mart app. Same-day delivery in DHA and Clifton. Prescription medicines are supplied only against a valid prescription. Use as advised by your doctor or pharmacist.