Framed shower doors are thinner by nature, as they rely on the frame to uphold most of the construction. They are constructed of weaker material, usually 1/8” to 3/16” glass. On the other hand, frameless shower doors do not rely on metal to hold them up, requiring a sturdier build. These are made of 3/8” to 1/2” tempered and polished safety glass. This glass also prevents the wobbling you find in traditional, cheaper doors when opening and closing them.