thrin, deltamethrin or lambda-cyhalothrin are usually used for impregnation, which last 6 to 12 months.
The net must be without holes and must be tucked under the mattress or sleeping bag to provide a sealed sleeping space.
The net must to packed during daytime to avoid mosquitoes entering during daytime.
The net should be supplemented with a repellent after dusk before going to bed under the impregnated net.
Repellents can be DEET (usually 20%), Autan and Mossi-guard which are synthetic and protects at least 4 hours.
Some repellents are made of natural oils like citronella and eucalyptus, but usually provide shorter effective protection. An exception is Mossiguard, which has been shown to be equal to DEET 20% in a 50% solution.