An eyewear (100, 200, 300, 400) comprising: a support (110, 210, 310, 410) configured to be carried on a head of a user and configured to support a lens (160, 260, 360, 462, 464) in a field of view of a user, the support comprising: an earstem (120, 130, 220, 230, 320, 330, 420, 430) comprising an exterior surface configured to be positioned proximate a lateral side of a user's head and a user's ear during use; and a nosepiece (146, 246a, 246b, 346, 446) comprising an exterior surface configured to be positioned proximate a user's nose during use; and a traction surface (150, 250a-c, 350a-c, 450c) on at least one of the earstem and the nosepiece, the traction surface being configured to exert a traction force on a contact surface (484, 492) at a plurality of contact points within the contact surface, the traction force being configured to inhibit slipping of the eyewear on a user's head when worn, wherein at a contact point within the contact surface, the traction surface is configured such that: when subject to a force in a first direction within a plane tangent to the contact surface at the contact point, the traction surface can exert up to a first amount of traction force before slipping, and when subject to a force in a second direction within the plane tangent to the contact surface at the contact point, the traction surface can exert up to a second amount of traction force before slipping, wherein the first amount of traction force when subject to the force in the first direction is greater than the second amount of traction force when subject to the force in the second direction, wherein the traction surface comprises a plurality of micro-scale or nano-scale protrusions extending obliquely from the exterior surface on which the traction surface is located, and characterized in that the traction surface is integrally formed on the support. an earstem (120, 130, 220, 230, 320, 330, 420, 430) comprising an exterior surface configured to be positioned proximate a lateral side of a user's head and a user's ear during use; and a nosepiece (146, 246a, 246b, 346, 446) comprising an exterior surface configured to be positioned proximate a user's nose during use; and a traction surface (150, 250a-c, 350a-c, 450c) on at least one of the earstem and the nosepiece, the traction surface being configured to exert a traction force on a contact surface (484, 492) at a plurality of contact points within the contact surface, the traction force being configured to inhibit slipping of the eyewear on a user's head when worn, wherein at a contact point within the contact surface, the traction surface is configured such that: when subject to a force in a first direction within a plane tangent to the contact surface at the contact point, the traction surface can exert up to a first amount of traction force before slipping, and when subject to a force in a second direction within the plane tangent to the contact surface at the contact point, the traction surface can exert up to a second amount of traction force before slipping, wherein the first amount of traction force when subject to the force in the first direction is greater than the second amount of traction force when subject to the force in the second direction, wherein the traction surface comprises a plurality of micro-scale or nano-scale protrusions extending obliquely from the exterior surface on which the traction surface is located, and characterized in that the traction surface is integrally formed on the support. when subject to a force in a first direction within a plane tangent to the contact surface at the contact point, the traction surface can exert up to a first amount of traction force before slipping, and when subject to a force in a second direction within the plane tangent to the contact surface at the contact point, the traction surface can exert up to a second amount of traction force before slipping, wherein the first amount of traction force when subject to the force in the first direction is greater than the second amount of traction force when subject to the force in the second direction, wherein the traction surface comprises a plurality of micro-scale or nano-scale protrusions extending obliquely from the exterior surface on which the traction surface is located, and characterized in that the traction surface is integrally formed on the support.