The phrase "good buffer" means having something or someone that can protect, absorb, or soften the impact of negative or stressful situations. Full definition
The brain is well buffered against the effect of arbitrary increases or decreases in circulating chemicals so that simply consuming food additives which are acetylcholine precursors will not normally increase your brain acetylcholine level. (newscientist.com)
There is a mound of dirt that they feel can create a very good buffer between the tennis courts and the skate park so one user won't know the other user is there,» Schultz said. (articles.chicagotribune.com)
Previously, the scientific community believed that the ocean was so well buffered that higher levels of atmospheric CO2 would have little impact on marine life. (scientificamerican.com)