A damper comprising: a) a damper cylinder having a closed end portion and an open end portion; b) a floating damper gas cup assembly disposed in, and slidingly engagable with, the damper cylinder to create a first chamber extending from the damper gas cup assembly toward the open end portion and a second chamber extending from the damper gas cup assembly toward the closed end portion, wherein the damper gas cup assembly includes: a gas-and-liquid-impermeable damper gas cup having a central longitudinal axis and having an outwardly-facing first circumferential surface with a fully-circumferential first surface groove, wherein the first surface groove is adapted to receive a first seal; and a liquid-permeable member disposed outside, and attached to, the damper gas cup and having an outwardly-facing second circumferential surface with a fully-circumferential second surface groove, wherein the second surface groove is adapted to receive a second seal; wherein the damper gas cup has an over-molded attachment to the member and comprises a plastic; and wherein the member comprises one of a porous powdered metal and a porous ceramic; c) a damping fluid disposed within the first chamber and in contact with the member; d) a gas disposed within the second chamber and in contact with the damper gas cup; e) a damper piston assembly disposed within the first chamber and slidingly engagable with the damper cylinder; f) a piston rod having a first end portion attached to the damper piston assembly and a second end portion extending outside the open end portion of the damper cylinder; and g) a rod guide assembly attached to the open end portion of the damper cylinder and adapted to guide the piston rod and to seal the damping fluid within the first chamber. a) a damper cylinder having a closed end portion and an open end portion; b) a floating damper gas cup assembly disposed in, and slidingly engagable with, the damper cylinder to create a first chamber extending from the damper gas cup assembly toward the open end portion and a second chamber extending from the damper gas cup assembly toward the closed end portion, wherein the damper gas cup assembly includes: a gas-and-liquid-impermeable damper gas cup having a central longitudinal axis and having an outwardly-facing first circumferential surface with a fully-circumferential first surface groove, wherein the first surface groove is adapted to receive a first seal; and a liquid-permeable member disposed outside, and attached to, the damper gas cup and having an outwardly-facing second circumferential surface with a fully-circumferential second surface groove, wherein the second surface groove is adapted to receive a second seal; wherein the damper gas cup has an over-molded attachment to the member and comprises a plastic; and wherein the member comprises one of a porous powdered metal and a porous ceramic; a gas-and-liquid-impermeable damper gas cup having a central longitudinal axis and having an outwardly-facing first circumferential surface with a fully-circumferential first surface groove, wherein the first surface groove is adapted to receive a first seal; and a liquid-permeable member disposed outside, and attached to, the damper gas cup and having an outwardly-facing second circumferential surface with a fully-circumferential second surface groove, wherein the second surface groove is adapted to receive a second seal; c) a damping fluid disposed within the first chamber and in contact with the member; d) a gas disposed within the second chamber and in contact with the damper gas cup; e) a damper piston assembly disposed within the first chamber and slidingly engagable with the damper cylinder; f) a piston rod having a first end portion attached to the damper piston assembly and a second end portion extending outside the open end portion of the damper cylinder; and g) a rod guide assembly attached to the open end portion of the damper cylinder and adapted to guide the piston rod and to seal the damping fluid within the first chamber.