For beachgoers this summer, Marks & Spencer is offering a Pure Cotton Sand Resistant Beach Towel for £15, which shoppers can effectively get for free through a cashback promotion with TopCashback. New members of TopCashback can receive a £15 welcome bonus, which when combined with the towel's price, allows for a full cashback return. The towel is praised for its softness and thickness, available in various colors including black, spice, and pink, and features a sand-resistant finish along with StayNewTM technology to maintain its quality over time. Customers have given it a high rating of 4.7 stars, with many expressing satisfaction with its quality and price. However, some reviews noted that the quality might not be exceptional for the price. To take advantage of this deal, shoppers need to purchase the towel through a specific link and wait for the cashback to be credited, which can take up to seven days.