They typically use port covers to block dust and dirt, raised lips/bumpers to keep the screen and camera off surfaces, and reinforced camera bumpers to absorb impact and reduce lens contact with surfaces.
Most listings identify polycarbonate as the primary case material. Several descriptions also note recycled plastic content, with examples across series stating about 45%, over 35%, or 50% recycled plastic.
Some listings include a detachable belt-clip holster in the box, while others are sold as "Case Only" and explicitly note that holsters or belt clips are not included (they may be sold separately).