We're all more than aware the being out in the sun without SPF protection is bad for our skin. Less obvious is the equal need to protect our hair from the sun's harmful rays, which fade colour and deplete moisture - resulting in evidence of the common distress signals of unhealthy hair [weak and brittle strands, dry ends, and frizziness]. Coloured hair is particularly vulnerable and sensitive to the oxidation caused by sun exposure, which will instantly fade colour, but even natural hair pigment is faded with sun exposure and will suffer noticeable moisture loss. With prolonged exposure, free radicals that attack hair will also incite the ageing process, weakening and thinning hair, and resulting in a noticeable loss of volume.