This is the pillow I've been using for the cover and it fits pretty well. I'm hoping it also fits the official Marine daki. Acanva Fluffy Bed Sleeping Side Sleeper Body Pillow Insert, Long 20” x 60”, White https://www.amazon.com/dp/B08FRDQQW7/ref=cm_sw_r_apan_glt_i_6184V80CKFMSN80XM2KP?_encoding=UTF8&psc=1