Believe it or not, there's been a lot of research regarding flip-flops. A recent study found that flip-flop wearers tend to grip the footwear with their toes, causing shorter stride length and improper force when their feet hit the ground.
Learn How Flip-Flops Can Be One of the Major Causes of Plantar Fasciitis
Flats and flip-flops can hurt your feet, too - Vox
3 Ways to Prevent Flip Flops from Hurting Your Feet - wikiHow
The Effects of Flip Flops on Your Body - FAST-Training
The Crazy Daisies: It's official: Flip Flops are a Flip Not
Are Flip Flops Causing Your Foot Pain? - Dr. Atencio
Is it bad to wear flip-flops?
The Real Dangers of Flip-Flops
Foot pain and Flip flops
Shop These Orthopedic Flip-Flops That Relieve Foot Pain