Because seat height adjustability is such an important ergonomic factor, the ZUMA® line includes two adjustable task chair models to accommodate a wider range of students. Both models feature a comfortable, sleek ergonomic design, 5-point base with dual-wheel hooded casters, and pneumatic height adjustment for quick, easy adjustments. The ZTASK 15 features a compact seat and shorter adjustment range that’s ideal for elementary and intermediate school students, as well as smaller students in upper grades. The seat height adjusts from 14" to 17". By contrast, the ZTASK18 is great for high school students, as well as college students and all adults who prefer adjustable mobile task seating. The seat height adjusts from 16" to 20 1/2". With your choice of 22 classic and surprising colors, it’s easy to incorporate these chairs into virtually any computer classroom, technology lab, or other learning environment.