Tender’s sunglasses are hand made in England from cellulose acetate derived from cotton pulp.
The fronts of the frames are carved out from a single thick sheet of acetate, and the sides are shaped to grip the head (rather than sitting on the wearer’s ears) based on a pair of 1950s tortoiseshell glasses. A hole is drilled through at the tips of the side bars, as an interpretation of the way in which wire spectacles were made in the Eighteenth Century. The wire was bent around to form a loop at the end, which would shape to the ears and head. The hole in the tip of Tender’s glasses allow them to be worn with a neck cord, and are delivered with a removeable leather thong. They are presented wrapped in an English-woven cotton satin handkerchief.
The joints of the glasses are made with extra wide 5- and 7-chenier hinges (a chenier is a section of a hinge- the more cheniers, the more solid the hinge) which are pinned to the frames (rather than the glued hinge and decorative mock pins often used). The lenses are fully UV protective and coloured grey-green.
Any good optician should be able to change the dark lenses of Tender’s sunglasses to prescription lenses, if necessary.