Element Case's new iPad Air case strikes us as one of its cooler products in some time. Soft-Tec Pro ($80) can take on multiple forms, changing from a playthrough case to a folio as you choose. At the heart of it, there's a rubber frame with a ring of plastic inside. When being used with the lid attached, a plastic backplate is optional, and two inserts fit into slots where the cover would attach. When you want a folio, pop those inserts out, and…