Our colleague Joost enjoys walking with his son and Studio Gris. Check out our blog post joolz.com blog .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 .Studio gris. Recent posts. Inspiring mom Janine from Pret a Pregnant. Behind the scenes at Joolz Photoshoot Amsterdam. Ambassador Story Joolz Geo Mono .