Just sneakers in general. Like maybe some white leather jack purcells. Is it possible for sneakers to "lose their shape"? AFAIK Sneakers do not loose their shape. But I use trees to absorb moisture and not to ease creasing and such. What kind of sneakers do you use them on and do you use wooden trees or plastic ones? Also what's the difference between a sneaker and a trainer??? Sneaker is just a general type of shoe. Such as casual vans or Sperry. Trainers are athletic shoes, such as New Balance Running Shoes or Puma Training Shoes.