M&S Beauty is the official partner of Look Good Feel Better's annual walk, which is taking place on Sunday 3 September in the Surrey Hills.
The walk aims to raise money for women managing the visible side effects of cancer treatment.
It is a family and dog-friendly event with a choice of three distances – 10km, 6km or a shorter buggy-friendly route.
Taking part costs £40 for a family of four or £20 for one adult and there is a free goody bag at the finish line. You can sign up at bit.ly/SWALK2017.