An adjustable height golf tee system having a tee and an anchor is discussed. The tee is height-adjustable relative to the anchor. A first anchor includes a cap, a stem, and a tip. The stem can be threaded internally, externally, or a combination thereof. A second anchor includes a base, a first stem, a cap, and a second stem as well as optional spacers. The stems can be threaded internally. Both the first and second anchors can be composed multiple pieces (e.g., a detachable cap, a detachable stem, or a detachable portion thereof) to provide access to an inner cavity of the respective stems.

An adjustable height golf tee system having a tee and an anchor is discussed. The tee is height-adjustable relative to the anchor. A first anchor includes a cap, a stem, and a tip. The stem can be threaded internally, externally, or a combination thereof. A second anchor includes a base, a first stem, a cap, and a second stem as well as optional spacers. The stems can be threaded internally. Both the first and second anchors can be composed multiple pieces (e.g., a detachable cap, a detachable stem, or a detachable portion thereof) to provide access to an inner cavity of the respective stems.

An adjustable golf tee comprises a body extending from a head, a plurality of bulbous portions extending radially from the body and spaced apart along a length of the body, and a flexible stop adjustably secured to the body between an adjacent pair of the plurality of bulbous portions. The flexible stop comprises a disc defining a central hole through which the body is configured to pass to releasably connect the flexible stop to the body.

An adjustable golf tee comprises a body extending from a head, a plurality of bulbous portions extending radially from the body and spaced apart along a length of the body, and a flexible stop adjustably secured to the body between an adjacent pair of the plurality of bulbous portions. The flexible stop comprises a disc defining a central hole through which the body is configured to pass to releasably connect the flexible stop to the body.

A golf tee for a swing practice training mat is disclosed. The golf tee is designed for playing a golf ball off of a mat, at a desired elevation, without the need to lift the mat and change the tee. The present invention allows for replacement of the tee from a top surface of the mat. The golf tee is formed as a cylindrical body having an axial bore for retaining a shaft end of a conventional tee therein. A plurality of raised ridges are disposed at a radially offset angle along a longitudinal length of the cylindrical body. The plurality of ridges may be configured for threaded engagement with a hole in the swing practice training mat.

A golf tee for a swing practice training mat is disclosed. The golf tee is designed for playing a golf ball off of a mat, at a desired elevation, without the need to lift the mat and change the tee. The present invention allows for replacement of the tee from a top surface of the mat. The golf tee is formed as a cylindrical body having an axial bore for retaining a shaft end of a conventional tee therein. A plurality of raised ridges are disposed at a radially offset angle along a longitudinal length of the cylindrical body. The plurality of ridges may be configured for threaded engagement with a hole in the swing practice training mat.

An adjustable height golf tee system having a tee and an anchor is discussed. The tee is height-adjustable relative to the anchor. A first anchor includes a cap, a stem, and a tip. The stem can be threaded internally, externally, or a combination thereof. A second anchor includes a base, a first stem, a cap, and a second stem as well as optional spacers. The stems can be threaded internally. Both the first and second anchors can be composed multiple pieces (e.g., a detachable cap, a detachable stem, or a detachable portion thereof) to provide access to an inner cavity of the respective stems.

An adjustable height golf tee system having a tee and an anchor is discussed. The tee is height-adjustable relative to the anchor. A first anchor includes a cap, a stem, and a tip. The stem can be threaded internally, externally, or a combination thereof. A second anchor includes a base, a first stem, a cap, and a second stem as well as optional spacers. The stems can be threaded internally. Both the first and second anchors can be composed multiple pieces (e.g., a detachable cap, a detachable stem, or a detachable portion thereof) to provide access to an inner cavity of the respective stems.

A racquet includes a handle; and a frame connected to an end of the handle, the frame defining a rounded interior space, the frame including a negative Poisson's ratio (NPR) foam material, in which the NPR foam material, and in which the frame has a Poisson's ratio of between 0 and −1; and a network of strings stretched across the rounded interior space defined by the frame. A golf tee includes an elongated stem; and a head disposed at an end of the elongated stem and shaped to receive a golf ball; in which at least a portion of the golf tee is formed of a negative Poisson's ratio (NPR) foam material, in which the portion of the golf tee has a Poisson's ratio of between 0 and −1, and in which the NPR foam material includes an NPR metal foam, an NPR ceramic foam, or an NPR-PPR composite foam.

A racquet includes a handle; and a frame connected to an end of the handle, the frame defining a rounded interior space, the frame including a negative Poisson's ratio (NPR) foam material, in which the NPR foam material, and in which the frame has a Poisson's ratio of between 0 and −1; and a network of strings stretched across the rounded interior space defined by the frame. A golf tee includes an elongated stem; and a head disposed at an end of the elongated stem and shaped to receive a golf ball; in which at least a portion of the golf tee is formed of a negative Poisson's ratio (NPR) foam material, in which the portion of the golf tee has a Poisson's ratio of between 0 and −1, and in which the NPR foam material includes an NPR metal foam, an NPR ceramic foam, or an NPR-PPR composite foam.