Mandibular advancement device

A mandibular advancement device comprising:

• an upper tray adapted to be fitted over a user's maxillary arch and comprising a pair of adjustable stop members, the upper tray comprising a pair of posts extending laterally from respective buccal sidewalls of the upper tray core, each post including a button disposed at an outboard end thereof, wherein each of the buccal sidewalls comprise a window section formed therein, wherein the window section comprises a sill that is disposed below an upper margin of the buccal sidewall, the pair of posts extending from the buccal sidewalls below the sill;
• and
• a lower tray adapted to be fitted over the user's mandibular arch and comprising a pair of fins extending from the lower tray, each of the fins being configured to engage a respective stop member to inhibit posterior movement of the lower tray when worn by the user, the pair of adjustable stop members being shiftable along the upper tray so as to set a desired degree of mandibular advancement when engaged with each of the fins,
• the upper tray comprising an upper tray core and the lower tray comprising a lower tray core having opposed maxilla and mandible-facing surfaces, the cores being formed from a first material having a first softening point temperature,
• each of the upper and lower trays further comprising an outer layer overmolded onto the core and covering the maxilla and mandible-facing surfaces, the outer layer being formed from a second material having a second softening point temperature that is less than the first softening point temperature.