An expandable introducer sheath comprising: a first layer comprising: a first longitudinally extending spine, and a longitudinal axis extending parallel to the first longitudinally extending spine, a first plurality of curved arms attached to and extending away from the first longitudinally extending spine, and around the longitudinal axis in a circumferential direction so as to at least partially define a longitudinally extending lumen, wherein the first plurality of curved arms is elastically resilient and configured to move away from the longitudinal axis when exposed to a radially outwardly directed force and to move back toward the longitudinal axis upon release of the force, and at least one additional layer (30, 40) positioned around the first layer, the additional layer (30, 40) comprising: an additional longitudinally extending spine (32, 42), and an additional plurality of curved arms (34, 44) attached to and extending away from the additional longitudinally extending spine (32, 42), wherein the additional plurality of curved arms (34, 44) at least partially overlays the first plurality of curved arms, wherein the additional plurality of curved arms (34, 44) is elastically resilient and configured to move away from the longitudinal axis when exposed to a radially outwardly directed force and to move back toward the longitudinal axis upon release of the force, wherein longitudinal motion is restricted between the first layer and the additional layer (30, 40), wherein the additional plurality of curved arms (34, 44) is configured to slide circumferentially along the first plurality of curved arms, and wherein the first plurality of curved arms and the additional plurality of curved arms (34, 44) extend from the respective longitudinally extending spines in alternating directions along the longitudinal axis. a first layer comprising: a first longitudinally extending spine, and a longitudinal axis extending parallel to the first longitudinally extending spine, a first plurality of curved arms attached to and extending away from the first longitudinally extending spine, and around the longitudinal axis in a circumferential direction so as to at least partially define a longitudinally extending lumen, wherein the first plurality of curved arms is elastically resilient and configured to move away from the longitudinal axis when exposed to a radially outwardly directed force and to move back toward the longitudinal axis upon release of the force, and a first longitudinally extending spine, and a longitudinal axis extending parallel to the first longitudinally extending spine, a first plurality of curved arms attached to and extending away from the first longitudinally extending spine, and around the longitudinal axis in a circumferential direction so as to at least partially define a longitudinally extending lumen, wherein the first plurality of curved arms is elastically resilient and configured to move away from the longitudinal axis when exposed to a radially outwardly directed force and to move back toward the longitudinal axis upon release of the force, and at least one additional layer (30, 40) positioned around the first layer, the additional layer (30, 40) comprising: an additional longitudinally extending spine (32, 42), and an additional plurality of curved arms (34, 44) attached to and extending away from the additional longitudinally extending spine (32, 42), wherein the additional plurality of curved arms (34, 44) at least partially overlays the first plurality of curved arms, an additional longitudinally extending spine (32, 42), and an additional plurality of curved arms (34, 44) attached to and extending away from the additional longitudinally extending spine (32, 42), wherein the additional plurality of curved arms (34, 44) at least partially overlays the first plurality of curved arms, wherein the additional plurality of curved arms (34, 44) is elastically resilient and configured to move away from the longitudinal axis when exposed to a radially outwardly directed force and to move back toward the longitudinal axis upon release of the force, wherein longitudinal motion is restricted between the first layer and the additional layer (30, 40), wherein the additional plurality of curved arms (34, 44) is configured to slide circumferentially along the first plurality of curved arms, and wherein the first plurality of curved arms and the additional plurality of curved arms (34, 44) extend from the respective longitudinally extending spines in alternating directions along the longitudinal axis.