Rigid stability cradle provides high arch support, deep heel cupping and comfort through the stride Provides improved motion control to reduce over-pronation and supination – the leading cause of many common injuries such as plantar fasciitis and foot, knee, and lower back pain Designed for those seeking rigid support to improve foot, knee, and lower back discomfort Forefoot perforations increase air flow for enhanced breathability Trim-To-Fit sizing fits most shoe types and foot sizes FSA HSA Eligible Item - The Spenco Lower Back Support Insoles are eligible for purchase with Flexible Spending Accounts (FSAs) and Health Savings Accounts (HSAs).