hi
look in argos catalogue or online in fishing section sure they have 2 pairs usually £15-£30
had the cheaper pair thought were good, always breaking em.
get the ties that tie round end of arms on sunglasses from opticians, so can dangle on chest if fall off.
sorry forgot to add fishing glasses are polarised.
also find BLOC a good make, ski-ing sports brand not silly dear prices, can get a pair for £30,
polarised would be dearer.
Lee