The Calidum is not a cap like the others. Featuring a classic 5-panel design, it's made from the same performance structured mesh material as our Konseal climbing harness. The result: a durable and breathable cap that's ideal for everything from trail running outings to relaxing in camp and pit stops in town. The stretchy material adapts to the shape of the head, while the TPU strap equipped with a buckle guarantees a perfect fit.