The softness or coarseness of a material can depend on several factors. For example, the size and shape of the constituent polymers can affect the softness of a material. Bottlebrush polymers have additional polymers attached to the linear backbone, leading to a structure more akin to a bottle brush you might find in your kitchen. The bottlebrush polymer structure imparts the ability to form extremely soft elastomers.

Similarly, sand with rounder grains usually feels softer because the grains slide past each other more easily. Smaller grains also don’t produce the pinprick feeling of individual grains pressing into your skin.
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