The Storm Twin Pack contains one bottle of Storm Cleaner 300ml & one bottle of Storm Proofer 300ml to offer you the best value option for when you want to clean & proof your gear in one go We love the fact that you can use the cleaner & the proofer from Storm together in one wash this saves hassle & time when you need to get your gear clean & performing as it should in bad weather so you can get back out there So easy to use simply put the cleaner in the detergent compartment & the proofer in the conditioner compartment & set the machine The Storm Proofer does not require direct heat to become active just leave the item in a warm room for about 12 hours once it has been treated in the wash & air dried for the best results