Mitten Apron by Ontwerpwerk and Flex. With these built-in oven gloves, you always have an oven mitt within reach. The buttons on the apron are also useful to attach a tea towel. Washing instructions: Warm water, no bleach. FLEX/the INNOVATIONLAB® is an international design bureau, responsible for innovative products of major brands such as BK, TNT-post and Philips. The products from Flex have won international awards and are displayed in several museum collections including the MOMA in New York and the Stedelijk Museum in Amsterdam. Royal VKB is a brand of by Koninklijke van Kempen and Begeer founded in 1789 and is located in Zoetermeer, The Netherlands. A combination of traditional craftsmanship with the most modern techniques is found in the manner in which we develop our products and bring them onto the market.