British actress and Ric O'Barry's Dolphin Project ambassador Maisie Williams has designed a limited edition t-shirt to benefit the charity, with 100% of proceeds going towards the protection of dolphins worldwide.

The Game of Thrones star unveiled the tee on Instagram, posting 'Winter is here ❄️⚔️🐬 For a limited time only (until Dec 11th) pls support my favourite charity by purchasing one of my official shirts'.