If you’re a glasses wearer (and with the current heatwave, that’ll be all of us in our sunglasses), CotiVision‘s colourful eyewear chains could be just the thing to shake up your summer wardrobe. And in honour of National Eyewear Day, which falls on 6th June, we’ve teamed up with the brand to offer 20 readers the chance to add a fun rainbow eyewear chain to their accessories collection.