LD Mountain Centre says:
Ex4 Anti Mosquito Spray from Lifesystems is a great way to give yourself increased protection from biting insects while you are on your travels. Some insects can still bite you even if your skin is cover so using insect repellent on exposed skin is not always enough to protect you. EX4 Anti Mosquito Spray can be used on all sorts of fabrics to keep the little pests away from your clothing, tent, rucksack and sleeping gear.
EX4 Anti Mosquito Fabric Treatment
Lifesystems EX4 Anti-Mosquito clothing treatment provides long-lasting and durable protection for use on textiles e.g. on clothing, tents, sun shelters or rucksacks. EX4 can be used as one of a series of measures designed to protect against tropical diseases like Malaria, Dengue Fever and West Nile Virus. The treatment is sprayed onto the textile and will stay in place for several washes. One bottle treats approximately 3.5 square metres of fabric.