The Donna Glove is a bag shaped glove filled with a sort of mineral oil that will improve the detection rate while performing your breast exam. According to the site:

Donna Glow works on the scientific principle of locking and enlarging. It magnifies palpation, reduces friction and stops lumps from moving during examination. Breast lumps the size of a fine sugar grain can be detected which is hardly possible with the bare hand.

You perfrom the exam in the same fashion as usual but with the glove on. There is a page displaying a clinical study on the website.

In my opinion, the site needs some work and lacks credibility, the product and idea sounds great though.