"Double high lead" means that in the marathon, the runner wearing "double high (or three high)" technology in running shoes is ahead of other runners as a leader. Among them, "double height" refers to two technologies in running shoes: carbon plate and nitrogen filling. Carbon plate can improve the stability and elasticity of running shoes, making it easier for players to achieve high speed; Nitrogen filling can provide better cushioning effect and reduce the weight of shoes.

It is of great significance to be ahead in the marathon. First of all, players equipped with high-tech running shoes can run more comfortably and stably, and reduce the injury and fatigue to their feet. In addition, carbon board and other techniques can also improve the speed and sensitivity of players and help to create better results. At the same time, the front runner can also provide a leading role for the players behind, encouraging them to surpass themselves and achieve breakthroughs.

Although "two heights ahead" has obvious advantages in marathon, it also leads to some thoughts on fair competition. On the one hand, high-tech running shoes are expensive, and not everyone can own them, which has caused unfair competition opportunities to some extent. On the other hand, whether some high-tech running shoes technology conforms to the principle of fairness in sports competition also needs more attention and discussion. In this context, we need to balance the relationship between technological innovation and fair competition, so as to ensure that athletes can reach their best in healthy competitions.