I can thoroughly understand the airlines ones, after all if one wants to go climbing or camping overseas you likely need to fly there! But Kickers shoes!!!!!! ?????
Google picks ones they think suit YOU if you don't tighten your security tightly enough. There was a thread about it a month back. Maybe you wrote 'kick' in a thread once?
I don't see them thanks to ADblock etc. but apparently their selections of suitable adverts are amusing.
NPC, I really cannot ever recall seeing a thread here about Kick, kicking, kicker, or anything like it or even just that in a thread title! Must have got in there as it is boots and shoes I reckon, likely hot on the trail of the spam shoe threads perhaps!
I can thoroughly understand the airlines ones, after all if one wants to go climbing or camping overseas you likely need to fly there! But Kickers shoes!!!!!! ????? 
