A wrap-around cable sleeve assembly for environmentally sealing a cable section, the wrap-around cable sleeve assembly comprising: a wrap-around sleeve having a longitudinally extending portion and opposed first and second longitudinal edges (120, 122), wherein the longitudinally extending portion defines a portion of a cable chamber extending around the cable section when the wrap-around sleeve is wrapped around the cable section; a first cable mastic patch on an interior surface of the longitudinally extending portion and extending transversely across the longitudinally extending portion, wherein the first cable mastic patch is configured and positioned to engage the cable section and form a continuous environmental circumferential seal about the cable section when the wrap-around sleeve is wrapped around the cable section; and a second cable mastic patch on an interior surface of the longitudinally extending portion and extending transversely across the longitudinally extending portion, wherein the second cable mastic patch is configured and positioned to engage the cable section and form a second continuous environmental circumferential seal about the cable section when the wrap-around sleeve is wrapped around the cable section, wherein the second cable mastic patch is longitudinally spaced apart from the first cable mastic patch; and a longitudinally extending closure mastic strip mounted on the wrap-around sleeve adjacent the second longitudinal edge and configured and positioned to environmentally seal the first and second longitudinal edges of the wrap-around sleeve when the wrap-around sleeve is wrapped around the cable section; characterised in that the closure mastic strip is softer than the first and second cable mastic patches (152, 154) at all temperatures in a prescribed operating temperature range of the wrap-around cable sleeve assembly. a wrap-around sleeve having a longitudinally extending portion and opposed first and second longitudinal edges (120, 122), wherein the longitudinally extending portion defines a portion of a cable chamber extending around the cable section when the wrap-around sleeve is wrapped around the cable section; a first cable mastic patch on an interior surface of the longitudinally extending portion and extending transversely across the longitudinally extending portion, wherein the first cable mastic patch is configured and positioned to engage the cable section and form a continuous environmental circumferential seal about the cable section when the wrap-around sleeve is wrapped around the cable section; and a second cable mastic patch on an interior surface of the longitudinally extending portion and extending transversely across the longitudinally extending portion, wherein the second cable mastic patch is configured and positioned to engage the cable section and form a second continuous environmental circumferential seal about the cable section when the wrap-around sleeve is wrapped around the cable section, wherein the second cable mastic patch is longitudinally spaced apart from the first cable mastic patch; and a longitudinally extending closure mastic strip mounted on the wrap-around sleeve adjacent the second longitudinal edge and configured and positioned to environmentally seal the first and second longitudinal edges of the wrap-around sleeve when the wrap-around sleeve is wrapped around the cable section; characterised in that the closure mastic strip is softer than the first and second cable mastic patches (152, 154) at all temperatures in a prescribed operating temperature range of the wrap-around cable sleeve assembly.