An introducer set (1) comprising an introducer sheath (10) and a dilator (20). The introducer sheath (10) has a tubular body (11) with a distal portion (12) and a proximal portion (13). The tubular body (11) of the introducer sheath has a wall thickness (d) of 0.3 mm or less. The dilator (20) has a body (21) with a proximal portion (23), a distal portion (22) and an outer surface, the dilator (20) being insertable into the introducer sheath (10) such that its proximal portion (23) extends proximally of the introducer sheath (10) when the dilator (20) is inserted in the introducer sheath (10). At least one of the dilator (20) and the introducer sheath (10) comprises a stiffening structure (25) imparting stiffness to the tubular body (11) of the introducer sheath (10), wherein said stiffening structure (25) can deactivated.
