looked into something that was portable AND would hold up in our winter snows.  Been very pleased with this product.  Following their instructions, I got my dog to use it within a few hours.  It has been out in all sorts of weather and seems to be holding up well.  I like that it will not rust, folds easily and quickly, and has rubber strips to give them traction.  Unlike other similar products, this rubber strip seems to be the superior product.  The box it arrived in was damaged but maybe that was it was so bulky.  It was in pristine condition.  This is helping my dog tremendously with her mobility issues.