"Flat footwear" refers to shoes that do not have heels or any significant elevation in the sole. They are generally comfortable and provide a level surface for the entire foot while walking or standing. Full definition
Thankfully there are so many cute options in flatter footwear nowadays! (seekingsunshine.com)
By the way, there are lots of ways how to prevent the short - legged feeling by wearing flat footwear. (fashiontasty.com)
You may also start to notice your back aches at times and that you are a little off - balance; choose flatter footwear if this is the case! (breastfeedingmums.com)