Bug Proof Ultra Clothing Treatment is the same as the regular Bug Proof Clothing Treatment, but in a bigger bottle - 150ml instead of 100ml. This means that if the entire bottle is applied in a single treatment 50% more product is applied. Consequently, the treatment will then remain effective for up to 6 weeks. - contains 0.5% Permethrin (w/w) - supplied in a 150ml pump spray bottle for easy application - one bottle is enough to 'ultra' treat one outfit of clothing (shirt, trousers and socks) - one 'ultra' treatment lasts for up to six weeks