Speed 4<\/u><\/a> is what\u2019s most important, and it\u2019s certainly been enhanced by the improved fit. In general, it\u2019s smooth, lively and compliant for any pace. It feels softer and more cushy than the previous iterations and, like the third version, not nearly as agile and snappy as the sports car vibe of the second edition. It\u2019s still a very responsive shoe that feels great running at a variety of speeds, even if it\u2019s never going to be the nimble speedster that it was in its second edition. If you view this model as a better version of an everyday trainer (which it is) and not solely a speed-day shoe (which it isn\u2019t), then it\u2019s a win-win situation. <\/p>Why It\u2019s Great: <\/strong>It\u2019s great because it\u2019s better than the previous version, which, by the way, was still a very good shoe. The PWRRUN PB midsole is still one of the best midsole materials in the business, and Saucony put better complementary upper and outsole materials into this version of the shoe. After my initial runs, it was clear that the fourth edition is a combination of the best aspects of the second and third versions. It\u2019s a fairly light, comfortable, smooth-riding shoe with a lot of energetic pop, but with more stability than the second version and a better fit than the third version. If you had never run in any of the first three versions of the Endorphin Speed, you will try on this shoe and might be convinced it\u2019s going to be the best training shoe you\u2019ve ever worn.<\/p>Specs<\/strong><\/p>Weights: <\/strong>7.5 oz. (women\u2019s 8); 8.2 oz. (men\u2019s 9) Heel-Toe Offset:<\/strong> 8mm (36mm at the heel\/28mm at the forefoot)<\/p>