Redford said:
The only way greens may be helped by soft spikes over and above metal ones is if the greens are in a fragile state to begin with, otherwise, as the USGA has proved, they don't do jack for greens and in fact in certain cases can actually make the condition of some greens worse.
So why does the USGA ban metal spike usage in it's amateur tournaments, including NCAA events?
Both these quotes come straight from the USGA website:
" The conventional golf shoe spike not only caused severe damage to the grass plant, but the rounded shoulder of the spike also caused significant soil compaction and delayed grass recovery for weeks beyond that of other shoes. The ripple sole shoe soon dropped from the golfers' favor (and was banned by some clubs) because of the distortion it caused to the putting surface. The modified golf shoe spike, with the shoulder either flat with the sole or else recessed within the sole, proved to be less damaging to soils and turf, and it is still manufactured today for golfers who prefer spiked shoes but who are concerned with preserving putting green quality. "
" Both the player and the grass grower have a right to be concerned over golf shoes and what they are doing to the playing quality of our turf. But there is another, less visible factor that also deserves attention. There is increasing concern over the added costs in labor, aerifying, topdressing, mowing, weed control, cup changes, etc., brought about by spiked shoes. William H. Bengeyfield, one of the authors of this article, believes that $10 million is a conservative estimate, and he attributes that to course conditioning alone. What of the additional costs in replacing pro shop and locker room carpeting, asphalt and concrete paths, door sills, wooden steps, benches, electric cart flooring, dashboards, tee markers, etc.? Does the spiked shoe cost golf $15 million or $20 million a year? Whatever it is, there is no doubt of its destructiveness. "
On the issue of performance, only 25% of US tour players now use metal spikes, with that number significantly less on other tours. If soft spikes are clearly inferior to metal in terms of performance why are 75% of players on the richest and most demanding tour wearing them? If they give significantly less traction why are guys like Bubba Watson, Vijay Singh and Adam Scott wearing them?