The Grenen Sams? Series is Skagen's most-sustainable series to-date. This watch features a 37mm #tide ocean material? case, caseback and dial. The midnight dial features a visible solar-powered movement with a bio-based nylon movement holder, a partially bio-based nylon made with 45% castor oil crystal and a multicolor 100% rPET woven strap with stainless steel buckle and leather keepers. The watch strap is interchangeable. #tide ocean material? caseback is not engravable.