Expandable sheath with fold

An expandable sheath comprising:

• an elongate sheath body having a proximal end, a distal end, and a lumen extending from the proximal end to the distal end,
• wherein the elongate sheath body is radially expandable from an unexpanded state to an expanded state and radially contractable from the expanded state,
• wherein the elongate sheath body comprises:
• a first layer, wherein the first layer is a liner defining the lumen;
• a second layer disposed over the first layer, wherein the second layer is a patterned structure;
• a third layer disposed over the second layer;
• and
• a fourth layer disposed over the third layer,
• wherein the elongate sheath body includes a slit through the second layer and the third layer, wherein the slit extends from the distal end toward the proximal end of the elongate sheath body,
• wherein, in the unexpanded state, a first portion of the elongate sheath body overlaps a second portion of the elongate sheath body along the slit to form a fold, and
• wherein the fourth layer has elastic properties and is configured to seal the slit while permitting the elongate sheath body to radially expand and radially contract.