Silicone acts as a transdermal water loss barrier – in other words it stops moisture loss from your scar and skin. Acting as a barrier over your scar, this locks in moisture, which in turn helps soften and heal your scar. Your scar will have no SPF protection in, so this silicone strip with its factor 50, helps protect your scar from sun damage. Also, Silicone acts as a physical barrier, to prevent rubbing and friction (from clothing) over your scar. It is an “inert” substance – which mean it does not react with anything, so can be used on most skin types.