JAM JELLY FLAT SANDAL CRYSTALWHOLE SIZES ONLY: IF IN BETWEEN SIZES WE SUGGEST SIZING DOWN. On trend, nostalgic, and surprisingly versatile. JAM is the 90s era jelly ballet flat youll reach for again and again this season. Her airy, toe baring design and flat silhouette is made for easy styling and all day comfortable wear. In colorways like black, coral, crystal, and mocha, shes a modern and playful addition to everyday denim, flowy midi dresses, playful skorts, and so much more.