This week I tweeted that Jimmy Choo’s ICONS collection had gone on sale, and that the proceeds will benefit the Jimmy Choo Foundation. But Choo and Tamara Mellon aren’t the only high-fashion shoe designers doing good; Manolo Blahnik announced that he will be partnering with eco-conscious designer Marcia Patmos to produce a sustainable collection. As far as materials go, the designers have experimented with everything from cork and linen to discarded tilapia skins.

The collection, which will feature two styles: a strappy open-toe flat and a strappy heeled sandal in hues of electric blue, yellow, nude and black, will go on sale at Manolo Blahnik stores next spring. But be prepared to pay typical Manolo prices, as each shoe will retail for $895.

Of the collection, Patmos said to WWD, “I am always researching sustainable materials and developments. [Tilapia skin] is a by-product of the food industry that would otherwise be discarded, but it’s actually a beautiful material perfect for small leather goods. I love bringing the idea of sustainability into the luxury market — it doesn’t have to be limited to T-shirts and grocery bags.”