Stroll around for hours with your baby because the Joolz Studio collection is very The Joolz Studio collection is available in two colours for the Joolz Day Gris .Our colleague Joost from the marketing department is father to Roef and enjoys walking with his Joolz Day Studio Gris in the Westerpark in .Studio gris. Recent posts. Inspiring mom Janine from Pret a Pregnant. Behind the scenes at Joolz Photoshoot Amsterdam. Ambassador Story Joolz Geo Mono .