USS IMPERVIOUS MSO-449 SHIP HAT. Minesweeper. Navy Blue Cap High Detail and Impact. 8 Rows Stitching on Visor and Pro Stitch on Crown 5 panel hat. Adjustable Size, Navy Blue Golf Style. Great Gift Idea for ANYONE; especially those who served on the USS IMPERVIOUS. HatnPatch Is THE Veteran Owned Family Business. We Generally Ship Orders Within 24 Hours And Usually The SAME DAY!