whats the difference between mma gloves and hand protectors as shown?

http://www.kwon.com/kwonusa/artikeldetails.asp?ShopSprache=5&agnr=40081&ag=Competition+Hand+protectors

if that dosent work go to kwon.com and type in hand protectors it is the first thing titled competition hand protectors


what is the difference between these as opposed to mma gloves used in wec ufc pride etc.