Zeal X Kraft Corrugated Padded Mailer is made of paper, inside and out of paper, FS paper recyclability certification, easy to recycle, save effort and time. They provide the same level of protection for your products as standard bubble mail, but they're easier to recycle and better for the planet. Paper lining, same protection. The lining of the zeal x envelope is not polyethylene, but a protective lining made of corrugated paper, which gives the envelope strength and rigidity. Surf pad mail is as strong as a foam lined envelope and protects your product just as well. Sticky strips mean that products can be packed and protected in seconds. 100% recyclable and reusable. Easy to recycle: no need to separate plastic from paper. It is ideal for some countries that ban double-material packaging.