i was flying from stl to ord 2/25 on flight 1102. upon entering the plane, i was greeted by a young male f/a dressed in the new uniform but wearing fluorescent yellow running shoes. it kind of took me aback. i wouldn't thought of it much of it until i witnessed the very stilted safety announcements he made--stumbling over words--and very awkward serving of first class where i was seated. i'm assuming the crew was very junior--maybe new hires--although i don't know that for a fact. in my experience, new hires are usually all "spit and polished." he was not. in addition, he seemed from my interactions with him in the cabin--and i hate to use the word--dim, or impaired in some way. my thought was that if this guy can't follow basic dress regulations and service flow, how is he going to handle safety issues, should i email the company about this?