These are honestly the best knee pads we have found for 1.5 to 12 year olds. The super light Transition pads are designed for the little rippers out there that ride scoot bikes to pedal bikes. The Transition pads mould with body heat to provide maximum comfort with a breathable mesh back panel to wick moisture away from the skin. Each pack contains 2 knee pads. Note that the construction and sizing for KIDS and YOUTH sizes are different. YOUTH sizes are larger - Youth S/M is one size larger than Kids Large. Kids Size Guide Size Age Kids Small 2 - 4 Kids Medium 4 - 5 Kids Large 5 - 7 Youth Size Guide Size Thigh Size Youth S/M 10.5 - 12.5" Youth L/XL 12.5 - 14" Take measurement 6? above knee cap when leg is bent at 90 degrees