9b5177fb_rn_Furniture_and_Modern_Design__Spring_Mattress
[0] Movement [Sonno Collection] No “warm-up” period means the sleeper can easily shift positions during the night, with no sleep disturbance. Foam is movement dampening, so won't disturb partner [Other Foam] “Warm-up” period makes it difficult to move out of the groove from initial sleep position and to adjust to a new position [Spring Mattress] 
Spring construction makes movement difficult without disturbing sleeping partner
Design Within Reach: The Best in Modern Furniture and Modern Design
Spring Mattress