We report the synthesis and characterization of fully saturated hydrocarbon block copolymer thermoplastic elastomers with competitive mechanical properties and attractive processing features, Block copolymers containing glassy poly(cyclohexylethylene) (C), elastomeric poly(ethylene-alt-propylene) (P), and semicrystalline poly(ethylene) (E) were produced in a CEC-P-CEC heptablock architecture, denoted XPX, by anionic polymerization and catalytic hydrogenation, The X blocks contain equal volume fractions of C and F. totaling 40%-60% of the material overall. All the XPX polymers are disordered above the melt temperature for E(T-m,T-E congruent to 95 degrees C) as evidenced by SAXS and dynamic mechanical spectroscopy measurements, Cooling below results in crystallization of the E blocks, which induces microphase segregation of E, C, and P into a complex morphology with a continuous rubbery domain and randomly arranged hard domains as shown by TEM. This mechanism of segregation decouples the processing temperature from the XPX molecular weight up to a limiting value. Tensile mechanical testing (simple extension and cyclic loading) demonstrates that the tensile strength (ca. 30 MPa) and strain at break (> 500%) are comparable to the behavior of CPC triblock thermoplastic elastomers of similar molecular weight and glass content. However, in the CPC materials, processability is constrained by the order-disorder transition temperature, limiting the applications of these materials, Elastic recovery of the XPX materials following seven cycles of tensile deformation is correlated with the fraction of X in the heptablock. copolymer, and the residual strain approaches that of CPC when the fraction of hard blocks f(X) <= 0.39.