i had tech 6's that had the replaceable sole inserts. the soles wore out in a season, i tried first just replacing the inserts, they wouldnt stay on, then i took the boots to a cobbler he re-stitched the boot, and glued on a new complete sole, it lasted a month. alpinestar soles are junk. i switched to gaerne SG 10's ive had them for 2 seasons they look brand new. im not sure if tech 8's fit tech 4's, but the new sole no matter what boot its for wont last long. i wouldnt bother with the tech 8 soles, because the inserts dont stick at all.
Alpinestar Boot Repair Question
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gearne SG10's no break in needed, theyre comfortable the first time you put them on. 
if you replace the soles they might stay on fine. i just had trouble, and they do wear out fast. i wouldnt bother with the tech 8 soles though. as the inserts wont stick, if you replace them.
if you replace the soles they might stay on fine. i just had trouble, and they do wear out fast. i wouldnt bother with the tech 8 soles though. as the inserts wont stick, if you replace them.
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