G-Star RAW are giving you the chance to win one of their denim jackets from their fashion-conscience "RAW for the Oceans" line. The collection, now in its third year, sees a tightly curated selection of pieces designed and crafted in collaboration with Pharrell Williams, Parley for the Oceans and Bionic Yarn. Garments are ecologically sound, crafted from fibers of recycled ocean plastic combined with cotton.

Now Pharrell and G-Star RAW have released "Battle for the Big Blue," a new mobile game featuring sounds from Pharrell for iOS and Android – all designed to educate people about the increasing pollution levels in our oceans.

To celebrate the game's release, G-Star RAW are giving you the chance to win one of their denim jackets.

To enter:

1. Make sure you're following @gstarraw and @highsnobiety on Instagram; 2. Like this article's IG post; 3. Regram it with the hashtag #BattleForBigBlue and your size.

#BattleForBigBlue is now available on the App Store and Google Play.

Read more on the innovative RAW for the Oceans collection here.

Competition has closed. Congratulations to gershyg!