A foam product, that is a standup paddle board with a grip handle structure, comprising: a foam core including a tightly packed cluster of expanded beads, the foam core having a top surface on which some outermost beads of the expanded beads are exposed and bulging outward to form a bubbly texture; and a upper foam skin having a bottom surface bonded to the top surface of the foam core, and the bottom surface of the foam skin having a plurality of cavities sized and shaped to respectively receive the bulging, outermost beads on the top surface of the foam core, a non-foam plastic film having a bottom surface directly heat-laminated to the top surface of the upper foam skin, wherein the grip handle structure includes a soft shell and an opening extending through the upper foam skin and the non-foam plastic film, wherein the foam core includes a first foam body and a second foam body embedded in the first foam body (la), with the second foam body being more rigid than the first foam body, wherein a recess is defined in the second foam body of the foam core, wherein the recess has an upper space and a lower, enlarged space, wherein the soft shell is suited in the recess of the second foam body of the foam core, the soft shell having its outer wall attached to the inner wall of the recess, the soft shell has an upper space configured in size to receive four fingers of a human hand, and a lower, enlarged space to permit bending of the fingers, wherein the second foam body of the foam core includes a tightly packed cluster of expanded beads, with each of the expanded beads being made of a pre-expanded bead, and wherein the first foam body of the foam core is made of a tightly packed cluster of expanded beads, but with a different material, wherein some outermost beads of the expanded beads are exposed and bulging outward from the inner wall of the recess of the second foam body with different heights to form a bubbly texture T, wherein the upper foam skin is partly bonded to the second foam body via adhesives, and is mostly bonded to the first foam body via the inter-engaged convex and concave surfaces. a foam core including a tightly packed cluster of expanded beads, the foam core having a top surface on which some outermost beads of the expanded beads are exposed and bulging outward to form a bubbly texture; and a upper foam skin having a bottom surface bonded to the top surface of the foam core, and the bottom surface of the foam skin having a plurality of cavities sized and shaped to respectively receive the bulging, outermost beads on the top surface of the foam core, a non-foam plastic film having a bottom surface directly heat-laminated to the top surface of the upper foam skin, wherein the grip handle structure includes a soft shell and an opening extending through the upper foam skin and the non-foam plastic film, wherein the foam core includes a first foam body and a second foam body embedded in the first foam body (la), with the second foam body being more rigid than the first foam body, wherein a recess is defined in the second foam body of the foam core, wherein the recess has an upper space and a lower, enlarged space, wherein the soft shell is suited in the recess of the second foam body of the foam core, the soft shell having its outer wall attached to the inner wall of the recess, the soft shell has an upper space configured in size to receive four fingers of a human hand, and a lower, enlarged space to permit bending of the fingers, wherein the second foam body of the foam core includes a tightly packed cluster of expanded beads, with each of the expanded beads being made of a pre-expanded bead, and wherein the first foam body of the foam core is made of a tightly packed cluster of expanded beads, but with a different material, wherein some outermost beads of the expanded beads are exposed and bulging outward from the inner wall of the recess of the second foam body with different heights to form a bubbly texture T, wherein the upper foam skin is partly bonded to the second foam body via adhesives, and is mostly bonded to the first foam body via the inter-engaged convex and concave surfaces.