Sea To Summit Collapsible X Tumblers space saving design makes them ideal for weight conscious adventurers.

These tumblers are manufactured from food grade BPA free heat resistant silicone with wall fins that help dissipate the heat way from your fingers, allowing you to hold on to a hot cuppa comfortably.

The concertina design employed in these tumblers enables them to fold flat to a 15mm deep disc when not in use. When extended, the durable Nylon 66 rim provides extra support to prevent the opening from collapsing, whilst the inner walls have both calibrated imperial and metric measuring marks so the tumbler can be used as a measuring cup.