Goalkeepers must also wear a different coloured kit from the outfielders and officials. Common colours include yellow, green, grey, black and shades of blue. Since the 1970s, goalkeepers have also typically worn specialised gloves. They provide better grip on the ball and protect their hands from hard shots and headers, as well making it easier to punch or push the ball away. Caps were common between the 1910s and 1960s, as well as woolly jumpers, but these are not worn in any professional or semi-professional context today.