What is Put Wall? This is the key SpotGamma level that shows where is the largest amount of put gamma on the downside, which we assume the dealers are short. This can often provide an area of support as hedges get unwound or trades restructured. Interested in learning more? Related articles What is Put Wall Support? What are Zero Gamma Levels? What is a Call Wall? What is Volatility Trigger™? What is Call Wall Strike?