These shoes have been around since their release. The Men's 10 Shoe weighs exactly 7 ounces (my Nike Vaporfly 4% also weighs 7 ounces) and for this lightweight shoe they feel great. I alternate between two pairs for outdoor running and another pair for the treadmill. Perfect fit, comfortable and most importantly light for me. Sometimes one comes off, but it can be once every 10 starts. Great shoe for long, short, slow or fast runs.