BBC Sport's Ask Me Anything team explains how cooling jackets work and why they are being used by sports teams.

Manchester United are using their United States tour to trial new cooling jackets kit manufacturers Adidas feel will be in widespread use at next summer's World Cup. Extreme weather was a significant ...

Transfer grades: Viktor Gyokeres to Arsenal gets an A -- and might be the missing piece for Mikel Arteta Here's the latest news and notes from the summer transfer window, which is in full swing ...

Transfer grades: Liverpool's Luis Diaz to Bayern Munich; Viktor Gyokeres finally joins Arsenal Here's the latest news and notes from the summer transfer window, which is in full swing ...