16 C.F.R. § 1243.4 – Performance requirements.

(a) Restraint. The product shall not include a restraint system.
(b) Seam strength. When tested in accordance with § 1243.5(j), fabric/mesh seams and points of attachment shall not fail such that a small part, sharp point, or sharp edge is presented, as required in § 1243.3(a) and (b).
(c) Bounded openings. When tested to § 1243.5(c), all completely bounded openings that exist in the front, sides, or back of the occupant lounging area, or that are created when an accessory is attached to the product, shall not allow complete passage of the small head probe unless it allows the complete passage of the large head probe.
(d) Maximum incline angle. The maximum incline angle shall not exceed 10 degrees when tested in accordance with § 1243.5(d).
(e) Firmness—(1) Occupant support surface firmness. When the 3-inch diameter (figure 1 to this paragraph (e)(1)) hemispherical head probe is applied according to the test method for occupant support surface firmness, § 1243.5(f), the force required for a one-inch displacement shall be greater than 10 Newtons (N).
Figure 1 to paragraph (e)(1)—3-inch Head Probe
(2) Sidewall firmness. For products with a sidewall, when the 3-inch diameter hemispherical head probe is applied according to the test method for sidewall firmness in § 1243.5(g), the force required for a one-inch displacement shall be greater than 10 N.
(3) Firmness at intersection of sidewall and occupant support surface. For products with a sidewall, when the 3-inch diameter hemispherical head probe is applied according to the test method for firmness at the intersection of sidewall and occupant support surface in § 1243.5(h), the force required for a one-inch displacement shall be greater than 10 N.
(f) Sidewall angle. For products with a sidewall, the sidewall angle shall be greater than 90 degrees when determined according to the sidewall angle determination in § 1243.5(i).