-- Last Updated: Apr-20-13 6:16 PM EST --
... is actually tougher than Kevlar. Others here will know more details than I, but fiberglass has very good abrasion resistance. 100-percent Kevlar is what you find mainly in ultra-light hulls, and they, being so light, have less impact resistance too.
Anyway, for landings and launchings, there's no need to worry much about rocks. You'll get some scratches, and if you feel like being careful you can make sure the scratches are fewer and more minor than if you handle the boat more roughly. Your bigger concern is accidental collisions with rocks, not controlled landings. Also, an all-Kelvar hull is likely to have a foam-core floor, in which case it is more susceptible to damage from scraping over barely-submerged rocks than a single-layer hull, and much harder to repair too.
URCHIN Portable Anchor
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