We really are good at appropriately naming things. Base = plate pockets only, no cummerbund. MOLLE = The standard Slickster rear plate pocket has been replaced with the MOLLE Rear Plate Pocket. This offers extra space to attach MOLLE-compatible pouches and packs for ultimate customization.The rest is the exact same as the Slickster so we are saving time and money and re-using the same description:A minimalist multi-mission plate carrier for Military professionals. Say that 5 times fast. The Slickster is part of the ADAPT Carrier System which means it is scalable and customizable and guarantees us more business with the continually expanding line of ADAPT accessories. Build the perfect pack to suit your needs with our low-profile, but high-end design.Check this out guys and gals! The size of the carrier has nothing to do with your shirt size but everything to do with the size of your armor plate. When choosing your plate carrier size, you will want to pick it to fit what armor you have. READ THIS TO LEARN MORE.SIZE MEDIUM FITS - MEDIUM SAPI, ESAPI, SWIMMER PLATE, 10"x12" up to 10" x12.25" x1"SIZE LARGE FITS - LARGE SAPI, ESAPI, SWIMMER PLATE up to 10.5" x13.5" x1"