Dewi Griffiths, who is the 15th fastest UK marathon runner of all-time has signed a multi-year contract that will see him represent ASICS at marathon distance. The Welsh 26-year-old runner for Swansea Harriers recorded an outstanding time of 2:09:49 on his 2017 marathon debut in Frankfurt, the third fastest time in Europe last year. A longstanding fan of ASICS footwear, Griffiths will run in the new TARTHERZEAL 6 shoes, commenting, “ASICS shoes consistently provide me with lasting comfort and support,…