Envelopes. Windowless envelopes in C5 format. Paper quality: 100 g/m², 100% recycled. Closure: self-adhesive. Eco-labels: FSC, The Blue Angel, Myclimate. ELCO Proclima envelope, C5, windowless, self-adhesive closure, white, in a practical cardboard box with excellent opacity and inner print ELCO Proclima. Proclima - CO2 reduced: ELCO focuses on sustainability even in office communication. The paper of ELCO Proclima is visually indistinguishable from offset paper and offers a high whiteness of 100 ISO. Nevertheless, it is made from 100% FSC-certified recycled paper. Its production results in significantly lower CO2 emissions per ton.