The valshamr is a hamr — a "skin" or shape — of falcon feathers: put it on and you are a falcon, mind intact, wings real. It belongs to Freyja (Frigg owns one too, the sources note, though the poets almost never take hers off its peg), and it is the pantheon's sole rapid-transit system across the border into Jötunheimr.
Its flight log is all Loki, and all damage control: he borrows it to scout for stolen Iðunn and carries her home as a nut in his talons with Þjazi's eagle-wings roaring behind; he borrows it again to find Thor's stolen hammer, squeezing into Þrymr's windowsill for the world's tensest interview. The pattern amuses the poets: the goddess of love owns the strategic airlift capability, and the god of chaos holds the only pilot's licence.
What is a hamr?
The falcon cloak makes no sense without the word inside its name. A hamr in Old Norse is a shape, a skin, an outward form that a self can wear — and in Norse belief, forms were negotiable. A person of unusual power was hamramr, "shape-strong"; Ynglinga saga says Odin could lie as if asleep while he went abroad as bird or beast, fish or serpent. The giant Þjazi flies in an eagle's hamr; Suttungr takes eagle-shape to chase Odin home from the theft of the mead of poetry; in Völundarkviða in the Poetic Edda, swan-maidens set their feather-skins beside a lake and become women until the skins are taken up again.
What makes the valshamr remarkable is that it takes this dangerous inward talent and makes it outerwear. Most shape-shifting in the myths is a personal power; the falcon cloak is a possession — ownable, hangable, above all lendable. A god with no shape-magic of his own can knock on Freyja's door, borrow the skin, and be over the fells of Jötunheimr by nightfall.
The theft of Iðunn
The cloak's first great flight, told in Skáldskaparmál, is Loki cleaning up his own catastrophe. Trapped by the giant Þjazi in eagle-shape and dragged over stones until he begged, Loki had bought his freedom with a monstrous promise: to lure Iðunn out of Asgard with her apples of youth. He did; Þjazi carried goddess and apples off to his hall; and the gods began to grow grey and old. When they discovered whose fault it was, the choice they offered Loki was simple — bring her back or die.
Loki asked for Freyja's falcon-skin. Wearing it, he flew north into Jötunheimr, found Iðunn home alone while Þjazi rowed on the sea, turned her into a nut, and gripped her in his talons for the flight home. Þjazi returned, took his eagle-hamr and chased — the eagle's wings gaining on the falcon's with every beat. The gods in Asgard stacked wood-shavings along the wall; the falcon dropped over the rampart with the nut; and they fired the shavings so that Þjazi's eagle, unable to bank, blazed and fell inside the wall, where the gods killed him. The cloak's maiden voyage in the record ends with youth restored and a burning giant — a fair summary of its whole career.
Finding Thor's hammer
Þrymskviða, the funniest poem in the Poetic Edda, opens with Thor waking to find Mjölnir gone. His first move is not a search party; it is a flight request. Loki and Thor go straight to Freyja's hall, and Loki asks: will she lend her feather-skin? Her answer is the most generous line anyone speaks to Loki in the whole tradition: she would give it though it were made of gold, lend it though it were of silver.
Then the feathers whirred, as the poem says, and Loki flew into the courts of the giants, where he found Þrymr, lord of the þursar, sitting on a mound plaiting gold collars for his hounds. The interview is short and appalling: yes, Þrymr has the hammer, buried eight leagues deep, and the return price is Freyja as his bride. Loki flew home with the whirring skin and the bad news, and the rest of the poem follows the mythology's best-known scheme — Thor veiled as the bride, Brísingamen at his chest, Heimdallr's idea and Loki as sharp-tongued bridesmaid, until Mjölnir is laid in the "bride's" lap and the hall is slaughtered. None of it happens without the reconnaissance flight. The cloak never fights; it finds out, which in the myths is worth more.
Can anyone use the falcon cloak?
The sources answer by demonstration: the cloak is lent twice to Loki and works perfectly both times, so its magic evidently rides in the garment, not in Freyja. Whether Thor could have worn it, the poets never say — the joke of Þrymskviða is that Thor's problems are never solved by subtlety. Frigg's matching skin gets one outing in the manuscripts: in the prologue to the Geirröðr adventure, Snorri has Loki flying for pleasure in a borrowed falcon-shape credited to Frigg — the flight that ends with him caught on a windowsill and starved in a chest. On the cloak's one flight without a crisis behind it, in other words, Loki created the crisis on arrival. Terminology drifts too: Þrymskviða calls the garment a fjaðrhamr, "feather-skin," while Snorri's prose says valshamr, "falcon-skin." The tradition is consistent about the thing — a wearable bird-shape belonging to a great goddess and flown by Loki — and casual about its label.
In the primary sources
Skáldskaparmál in the Prose Edda carries most of the weight: the Iðunn-and-Þjazi tale names Freyja's valshamr explicitly, and Snorri anchors the story in Haustlöng, a ninth-century shield-poem by Þjóðólfr of Hvinir that he quotes at length. The Geirröðr prologue in the same book supplies Frigg's falcon-skin. In the Poetic Edda, Þrymskviða attests Freyja's fjaðrhamr, the loan, and the whirring feathers. Beyond these the cloak itself does not appear — but the wider hamr-world that explains it is everywhere: Völundarkviða's swan-skins, Ynglinga saga's shape-faring Odin, the eagle-shapes of Þjazi and Suttungr. The falcon cloak is a small object standing in a very large doorway of Norse belief.
Legacy
The feather-skin is one of mythology's most contagious images. The swan-maiden folktale — a bird-wife whose stolen feather-skin binds her to earth — spans Eurasia, and the Norse falcon cloak is its divine cousin. Modern fantasy has adopted it wholesale: shape-granting cloaks and feather tokens are stock magic in games and fiction, and Freyja's falcon-skin quietly shapes how she is drawn and remembered — the war-and-love goddess with feathers at her shoulders. And whenever a story sends its trickster to spy in bird-shape and come home with exactly the bad news everyone feared, it is flying on borrowed wings, and the loan slip says Freyja.
Frequently asked questions
What is the valshamr?
The valshamr ("falcon-skin") is a cloak of falcon feathers belonging to Freyja. Whoever puts it on becomes a falcon — able to fly, with their own mind intact. Snorri's Prose Edda also credits Frigg with one of her own.
Who uses the falcon cloak in the myths?
Loki, both times on record, and both times to fix disasters of his own making: once to rescue Iðunn and her apples from the giant Þjazi, carrying her home as a nut, and once in Þrymskviða to locate Thor's stolen hammer in Þrymr's halls.
Does the falcon cloak actually turn the wearer into a bird?
Yes — it is a hamr, a wearable shape. In Norse belief shapes could be changed or worn; the cloak packages that power as a garment, so even someone without innate shape-magic can fly. The wearer becomes a real falcon but keeps their own mind and speech on landing.
Why doesn't Freyja fly it herself?
The surviving stories simply never show her using it — the crises that need wings are Loki's, so the flights are his. Her instant willingness to lend it in Þrymskviða ("though it were of gold") suggests the cloak was understood as a resource for the gods' common need, with Freyja as its keeper.
Is the falcon cloak the same as Þjazi's eagle form?
Related but different. Þjazi and Suttungr fly in eagle-hamir that seem to be their own shape-power, like Odin's shape-journeys in Ynglinga saga. The falcon cloak is a separate garment that grants the shape to any wearer — magic as equipment rather than talent.