The seat surface width of urban outdoor leisure chairs significantly influences sharing comfort for two occupants. Standard two-person benches typically range from 120-150cm wide, providing approximately 60-75cm per person - slightly wider than the average hip width of 35-40cm. This extra space prevents physical contact between strangers while allowing adequate personal space.
Narrower designs below 110cm force occupants into proximity, creating discomfort through unintended contact and restricted movement. Conversely, excessively wide seats exceeding 160cm diminish the shared experience by creating psychological distance between users. The ideal width balances physical comfort with social interaction potential.
Ergonomically, sufficient width prevents shoulder constriction and allows natural arm positioning. Municipal standards often specify 65-70cm per person minimum, though cultural preferences vary - European designs tend toward narrower spacing than North American equivalents. Material flexibility also affects perceived comfort; wooden slats with gaps feel more spacious than solid metal surfaces of identical dimensions.
Ultimately, optimal seat width mediates between individual physical comfort and social functionality, making it crucial for successful public space design.